If your baby arrived early, you've already been through a lot — and you may be watching every milestone with extra worry. Here's something important to hold onto: premature babies often reach milestones a little later, and that's expected. With the right lens (and a little time), most preemies catch up beautifully. This guide explains "adjusted age," what to watch for, and how to support your premature baby's development.
The short answer: For babies born preterm, track milestones using adjusted age (your baby's age from their due date, not their birth date), usually until about age 2. Premature babies are automatically eligible for free Early Intervention in most states. Talk to your doctor if your baby isn't meeting milestones for their adjusted age, or loses skills they once had.
What is "adjusted age" (corrected age)?
Adjusted age is your baby's age calculated from their due date rather than their birth date. It's the single most important concept for preemie parents, because it sets fair expectations.
Example: If your baby is 6 months old but was born 2 months early, their adjusted age is 4 months — so you'd expect them to do what a 4-month-old does, not a 6-month-old. Most experts adjust for prematurity until around 2 years of age, by which point many preemies have caught up.
What to expect with development
Using adjusted age, premature babies generally follow the same milestone sequence as full-term babies for motor skills, language, and social development. You can use our free milestone checker and simply apply your baby's adjusted age — for example, the 6-month milestones page for a baby whose adjusted age is 6 months.
Signs worth watching (using adjusted age)
- Not holding head up steadily by ~4 months adjusted
- Not reaching for or grasping toys by ~6 months adjusted
- Not sitting with support by ~6–9 months adjusted
- Not babbling or responding to sounds and voices
- Very stiff or very floppy muscle tone, or strongly favoring one side
- Losing skills they previously had (talk to your doctor right away at any age)
Why preemies are watched a little more closely
Premature birth can increase the chance of differences in muscle tone, feeding, hearing, and vision, and sometimes developmental delays. This isn't a reason to panic — it's a reason for the regular follow-up your care team provides. Many NICUs run "high-risk infant follow-up" clinics, and your pediatrician will keep a close eye on development.
How to get help: preemies often qualify automatically
In most U.S. states, babies born significantly premature (or with low birth weight) automatically qualify for free Early Intervention — even without a delay — because of their increased risk. You can request an evaluation yourself; no referral or diagnosis is required. Services like physical, speech, and occupational therapy can be provided at home at little or no cost.
How to support your premature baby at home
- Practice skin-to-skin ("kangaroo care") — it supports bonding, regulation, and development.
- Do gentle tummy time (using adjusted age as your guide). See our tummy time guide.
- Talk, sing, and read constantly to build language.
- Follow feeding guidance from your care team; feeding can take preemies extra time to master.
- Keep all follow-up appointments and hearing/vision screenings.
- Use adjusted age whenever you compare your baby to milestone charts.
Frequently asked questions
When will my preemie "catch up"?
Many premature babies catch up to their peers by around age 2, though babies born very early may take longer. Using adjusted age helps you see their true progress.
How long should I use adjusted age?
Most experts adjust until about 2 years of age. Your pediatrician will guide when to transition to actual age.
My preemie qualifies for Early Intervention but seems fine — should I still enroll?
Many parents do. Even if your baby is doing well, monitoring and support during the early years carries no downside and can catch small issues before they grow.
The bottom line
Your premature baby is on their own timeline, and adjusted age is the fair way to measure it. Lean on your care team, use free Early Intervention (which preemies often qualify for automatically), and celebrate progress in their terms. With time and support, most preemies thrive.
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Sources: American Academy of Pediatrics (AAP); U.S. Centers for Disease Control and Prevention (CDC); March of Dimes. This article is for educational purposes and is not a substitute for professional medical advice. If you have concerns about your premature baby's development, talk to your pediatrician or care team.