Week 39 old
Week 39 of your baby's first year: a busy, mobile 9-month-old who's crawling, babbling, and eating more solids. Here's what's typical right now.
In short
At 39 weeks (about 9 months), many babies are crawling or pulling to stand, eating 3 solid meals a day plus 24-30 oz of breast milk or formula, and sleeping around 12-14 hours total with two naps.
🍼 Feeding
About 24-30 oz of breast milk or formula per day, plus roughly 3 solid meals. Offer a variety of soft, mashed, or finely chopped foods and let your baby self-feed safe finger foods.
😴 Sleep
Typically about 12-14 hours total, usually 10-12 hours overnight plus two naps. Wake windows are often around 2.5-3.5 hours. Always place your baby on their back on a firm, flat surface with no loose bedding, pillows, or bumpers.
What's happening this week
- •Around this age, many babies are mobile — crawling, scooting, or pulling up to stand at furniture.
- •Babbling often gets more speech-like now, with strings like "mama," "dada," and "baba."
- •Many 9-month-olds start using a pincer grasp (thumb and finger) to pick up small bits of food.
- •Object permanence is developing, so separation anxiety and stranger wariness are common and normal around now.
Milestones to keep in mind
- ✓By the 9-month checkup, the CDC notes many babies sit without support, move things from one hand to the other, and look for a toy when it's hidden.
- ✓Many babies around this age get upset when a parent leaves the room — a normal sign of attachment, not a setback.
- ✓Crawling is common but not on any fixed schedule; some babies skip it entirely, and that alone isn't a concern.
- ✓Bring up any milestones with your pediatrician at the 9-month visit — they screen development as a range, not a single week.
Growth
💡 Tip for this week
Now that your baby is pulling up and cruising, do a floor-level safety sweep: anchor furniture to the wall, lower the crib mattress, and cover outlets.
⚠️ When to call your pediatrician
Call your pediatrician if your baby isn't bearing weight on their legs when held, makes no babbling sounds, doesn't respond to their name, isn't sitting with support, or seems to lose skills they once had. Also call for fewer wet diapers, refusing to eat or drink, or a fever of 100.4°F (38°C) or higher.
Frequently asked
How much should a 9-month-old eat at 39 weeks?
Most babies this age take about 24-30 oz of breast milk or formula a day alongside roughly three solid meals. Milk or formula is still the main source of nutrition through the first year.
Why is my 9-month-old suddenly clingy?
Separation anxiety and stranger wariness are very common around now as object permanence develops. Your baby is learning you still exist when you leave — short, calm goodbyes and consistent returns help build that trust.
Is it normal that my baby isn't crawling yet at 39 weeks?
Yes. Crawling isn't a required milestone and follows a wide range — some babies scoot, roll, or go straight to pulling up and cruising. Mention how your baby is moving at the 9-month checkup so your pediatrician can reassure you or follow up.
Looking for the bigger picture? See the month 9 overview →
General guidance, not medical advice. Every baby develops at their own pace — talk to your pediatrician with any concerns.