You’ve done the research. You’ve asked the hard questions. You’ve made the decision: your child is starting ABA therapy. And then comes a new kind of uncertainty — not “should we do this?” but “what is actually going to happen?”

That question doesn’t get answered nearly often enough. Most of what families read about ABA therapy focuses on what it is and whether it works — not what the first three months look like from the inside, or what you’ll be doing, or what “slow progress” means versus “no progress.”

This guide is for the parent who has said yes and wants to know what comes next. Week by week, month by month — the realistic picture of starting ABA therapy and what to watch for as it unfolds. For more on ABA therapy results and what progress looks like over the longer arc, that’s worth reading alongside this.

What ABA Therapy Actually Is — A Quick Grounding

Before the timeline, a brief grounding: ABA — Applied Behavior Analysis — is a behavioral science-based approach to understanding how the environment influences a person’s actions, and using that understanding to teach new skills while reducing behaviors that interfere with learning or daily life.

As the National Institute of Child Health and Human Development (NICHD) describes, behavioral management therapy grounded in ABA is the primary evidence-based intervention for autism spectrum disorder. Research published in a comprehensive scoping review found that ABA produced improvements across 7 of 8 outcome categories in children with ASD, including language, social/communication skills, adaptive behavior, and problem behavior.

What ABA is not: a rigid, repetitive drill. Modern ABA — especially the naturalistic, family-led model Luna uses — looks like play, routine, and real-life coaching. It happens in your home, not a clinic. And the parent isn’t sitting in the waiting room. You’re in the room, learning alongside your child.

Weeks 1–2: The Assessment Phase

The first thing your BCBA does is not start therapy. They learn.

Before any behavioral goals can be written, your BCBA conducts a comprehensive assessment of your child’s current skills, challenges, and learning history. In ABA, this involves standardized tools — the VB-MAPP (Verbal Behavior Milestones Assessment and Placement Program) and ABLLS (Assessment of Basic Language and Learning Skills) are among the most commonly used — which assess where your child currently is across language, social, communication, and daily living domains.

The assessment process typically includes:

• Parent interview — your BCBA wants to know your child’s full history, what motivates them, what’s hardest, what a good day looks like, and what your family’s priorities are for therapy
• Direct child observation — in your home (in Luna’s virtual model, this happens via video), watching how your child navigates their natural environment
• Review of prior evaluations — diagnostic reports, school records, speech/OT notes
• Reinforcer assessment — identifying what your child actually enjoys and finds motivating (this matters more than it sounds — reinforcement is the engine of ABA)

With Luna’s virtual model, this entire assessment happens through your existing home routine. Your BCBA observes your child doing the things they actually do — playing, asking for snacks, responding to your directions, handling transitions. That home-based context isn’t a limitation. According to research on Naturalistic Developmental Behavioral Interventions, learning that happens in the natural environment with the child’s primary caregivers produces better skill generalization than clinic-based approaches — your child learns skills in the context where they need to use them.

What you should be doing in weeks 1–2: Answering your BCBA’s questions as fully and honestly as you can. The more they understand about your child and your family’s real daily life, the better the treatment plan they build. There’s no wrong answer here.

Weeks 2–4: Pairing and Rapport — Why It Looks Like Play

Here’s something that surprises many parents when they first observe ABA sessions: the first several weeks often look like playing. Your BCBA may be getting on the floor with your child, following their lead, offering preferred toys and activities with no demands attached.

This is not a warm-up. This is the therapy.

The process is called pairing, and it’s the foundation of everything that comes after. Before a child will engage with instruction — before they’ll try something difficult, tolerate frustration, or follow a direction from someone new — they need to feel safe and motivated around that person. The BCBA earns that trust before they begin asking anything of your child.

BCBAs trained in ABA consistently report that the first 30 days are about building the relationship, not measuring progress on behavioral goals. Progress in weeks 2–4 looks like:

• Your child being willing to enter the session space (if this was a battle before, its absence is meaningful)
• Eye contact and brief engagement with the BCBA
• Accepting preferred items from the BCBA without resistance
• Tolerating transitions out of preferred activities with less escalation

None of these feel like “ABA goals.” All of them are prerequisites for everything else.

The honest note: This phase can be frustrating for parents who expected to see behavioral change immediately. If it helps to reframe: your child learning to trust a new person and accept guidance from them is one of the hardest things they do. It’s not stalling — it’s progress you can’t measure yet.

Month 2: The First Behavioral Shifts

Around weeks 6–10, most families begin to notice something different. Not dramatic transformation — something quieter. A morning routine that used to take 45 minutes finishes in 25. Your child tries to say a word they’ve never attempted before. A transition that always ended in a meltdown is now met with some grumbling but no shutdown.

These early behavioral shifts are the first evidence that the pairing and initial skill work is taking hold. Your BCBA is now:

• Working on the first functional goals — typically the most pressing needs first: communication skills (how does your child ask for what they want?), safety behaviors (what happens when they can’t have something?), and daily living skills (dressing, mealtimes, tolerating routines)
• Collecting data every session — tracking specific behaviors with precision so decisions are based on what’s actually happening, not impressions
• Coaching you on how to respond — the reinforcement and redirection strategies that work in sessions need to happen in your home, at all hours. You are being trained alongside your child

For parents who have been managing behavioral challenges without structure, month 2 often brings a specific kind of relief: a framework. You have language for what’s happening. You understand why your child does certain things. You know what to do next.

Key Takeaway: Progress in month 2 is typically behavioral, not yet measurable in terms of skill mastery. Smoother routines, fewer incidents, more communication attempts — these are meaningful clinical gains even when they don’t show up on a graph yet.

Month 3: The Data Review and Goal Adjustment

At around the three-month mark, your BCBA conducts a formal data review. This is one of the most important moments in ABA — when the data collected across dozens of sessions is analyzed to answer the question: what’s working?

Goals that are moving toward mastery get maintained or advanced. Goals that aren’t moving get examined: Is the reinforcer not motivating enough? Is the instruction too complex? Does the environment need modification? Is there a co-occurring challenge (sensory, communication, anxiety) interfering?

Your BCBA may:

• Increase the difficulty of goals your child is mastering
• Change the teaching strategy for goals that are stalled
• Add new goals in areas where skill gaps have become clearer
• Adjust session structure based on what’s producing the best engagement

You are part of this review. Your observations at home — things your BCBA can’t directly observe — are data too. The goal update isn’t something that happens to your family. It happens with you.

By month 3, research findings are consistent: clinically meaningful adaptive behavior gains typically require 12–24 months of sustained ABA. What month 3 provides is evidence that the intervention is working — the foundation is in place. What families see at this stage varies widely depending on the child’s age, starting point, and intensity of services.

The Parent’s Role: You’re Not in the Waiting Room

In traditional clinic-based ABA, parents sometimes describe feeling like bystanders — their child goes into a room with a therapist, and they wait. Progress updates come in weekly summaries they don’t always understand.

Luna’s model is built on a different premise: the parent is the primary therapist. The BCBA is the coach.

Research on parent training for children with ASD found positive treatment effects in 15 of 17 studies, including evidence for improved child language and reduced autism severity when caregivers are trained as active participants. A separate ABA meta-analysis found that parent-implemented ABA programs led to improved social and adaptive outcomes compared to control groups.

What this means practically: every session involves coaching for you, not just time with your child. You learn:

• The specific prompting strategies that work for your child’s learning profile
• How to reinforce emerging skills throughout the day without a formal session happening
• How to handle challenging behaviors in the moment using consistent, evidence-based approaches
• How to read your child’s signals and adjust demands accordingly

How Luna trains families in ABA techniques is built on this parent-as-co-therapist model. And if you want a structured learning environment where you can build these skills with other families, the Luna Parent Lab group training course runs alongside your child’s therapy sessions.

This is why how many hours of ABA therapy your child may need is a more nuanced question than the raw numbers suggest. When a parent is implementing strategies for 10+ hours a day based on BCBA guidance, the effective therapeutic dose is far greater than any number of weekly clinic sessions.

The Emotional Reality: What No One Tells You

Starting ABA therapy is a significant undertaking. Parents often describe the first 90 days as hopeful, exhausting, uncertain, and occasionally discouraging — sometimes in the same week.

The things no one tells you:

Progress is not linear. There will be weeks where your child seems to regress. A skill they had mastered suddenly disappears. A behavior that had quieted flares back up. This is biologically normal — not a sign that ABA isn’t working. Data across sessions tells the real story; one bad week doesn’t.

You’ll feel frustrated before you feel competent. Learning new skills — which is what parent training is — involves an awkward stage. You’ll apply a technique wrong sometimes. You’ll feel like you don’t know what you’re doing. That’s the learning process. It gets easier with practice.

Early changes are subtle enough to miss if you’re looking for the wrong thing. The parents who cope best in the first 90 days are those who’ve recalibrated what “progress” looks like — not a sudden transformation, but one smoother morning, one less meltdown, one new approximation toward communication.

Your feelings about this process matter. ABA is demanding for families. Uncertainty, grief, hope, and exhaustion often share the same week. If you’re finding the process overwhelming, that’s worth naming with your BCBA — not just as a personal concern but as a clinical one. Your wellbeing directly affects your child’s outcomes.

“What If I Don’t See Progress?” — When and What to Ask

It’s normal to have no measurable skill gains in the first month. It becomes worth a conversation if, by month 3, you’re seeing no behavioral shifts whatsoever.

The right questions to ask your BCBA:

• What does the data show on the goals we set at intake?
• Are there specific skills showing movement, even if they’re not the ones I’m tracking at home?
• Is there something about the reinforcers, the instruction method, or the session structure that might be adjusted?
• Are there co-occurring challenges (sensory, communication, or anxiety) that might be interfering?

A good BCBA welcomes these questions. Data-driven practice means the plan is always subject to revision based on what the evidence shows. You are not inconveniencing anyone by asking.

Frequently Asked Questions

How long does it take for ABA therapy to work?

Research suggests that clinically meaningful adaptive behavior gains typically require 12–24 months of sustained ABA. That said, most families notice early behavioral shifts — smoother routines, more communication attempts, reduced meltdown frequency — within the first 6–10 weeks. Early indicators of progress matter even when formal skill mastery takes longer.

What happens in the first ABA session?

The first sessions typically focus on relationship-building (“pairing”) rather than direct skill work. Your BCBA will observe your child, follow their lead in play, and begin identifying what motivates them. If an initial assessment hasn’t already been completed, the first sessions are part of that process.

How often will my child have ABA sessions?

Session frequency varies based on your child’s age, diagnosis, and the goals established in the treatment plan. Luna’s model typically starts at 5–10 hours per week of BCBA-supervised sessions plus daily parent-implemented strategies. Your BCBA will recommend an intensity based on your child’s specific needs and your family’s capacity.

Do I have to be present for every session?

In Luna’s virtual, family-led model: yes, and this is a feature, not a burden. You’re not there to observe — you’re there to practice alongside your child. The goal is to build your skills so that the behavioral strategies work all day, not just during sessions.

What if my child refuses to engage in sessions?

Some children resist new people and new structures, especially early. This is one reason the pairing phase is so critical. Your BCBA is trained to work with avoidance and refusal — pacing demands to the child’s current comfort level, building motivation through preferred activities, and adjusting the session structure as needed. Refusal in week one does not predict outcomes in month three.

What Comes Next

The first 90 days of ABA therapy are not the hardest — they just feel that way, because you’re in them. By month three, most families have moved from uncertainty to direction: clearer goals, a developing skill set, and early evidence that something is shifting.

What makes the biggest difference in how those 90 days go is how actively the parent engages in the process. Not as an observer. As a learner. As a partner in a clinical process that only works when the whole family is part of it.

Luna’s model is built around that premise. Sessions are virtual, starting within days of enrollment, and your BCBA coaches you alongside your child from the very beginning. There’s no waitlist. Insurance is handled before you start. And the parent isn’t left guessing — you have a clinical partner who is tracking what’s working and adjusting accordingly.

If you’re ready to see what starting ABA therapy actually looks like with Luna, you can start ABA therapy within days — not months. Most families are surprised by how quickly the process begins.

You’ve already done the hardest work — the decision. What comes next is practice.