9 Week Old Baby Development

Learn everything you need to know about your 9 week old baby. Track important developments and milestones such as talking, walking, growth, memory & more.

Mother bathing smiling new born baby in bathtub
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Your Growing Baby

Sleepy Baby

Good news: By this week your baby might be sleeping six or more hours a night! Be prepared for a relapse though. She's still settling in to her sleep routine, and it's common for babies to take a step back, Zs-wise, before they make the next leap forward. And some might not start sleeping through for a few more weeks (or—sorry—even months). Help her along by keeping up a bedtime routine, putting her down at the same time every night and sticking to the same prebed activities, such as a warm bath and a reading of The Very Hungry Caterpillar before you tuck her in. Now that she's 2 months old, she's better equipped to soothe herself back to sleep, so let her fuss for a few minutes at night before you leap to her rescue. She might just surprise you by dozing off again by herself. No matter what sleep situation you're dealing with, keep working at it. That precious through-the-night sleep will come eventually.

Improving Physical Development

As your baby develops more physical control, her newborn reactions—such as the Moro (or startle) reflex—will start to fade. Meanwhile, new abilities take their place. You might see your little one shimmying around on her belly, even wiggling off her blanket during tummy time. Some babies start rolling from their back onto their side, but don't expect a full rollover yet, a milestone that will likely occur between ages 4 and 6 months. And don't worry if she appears to be moving less. It could just be that her more fine-tuned movements are less noticeable, or that she's working on another, less-physical milestone for the moment.

Health and Safety Info

Soothing Baby's Cries

Your baby might have wailed a lot during the first few weeks, but those cries weren't accompanied by actual tears since her tear glands weren't fully developed. Now that the glands are up and running, she's able to turn on the waterworks—unless she has a blocked tear duct. You'll know because your baby will have watery, goopy-looking eyes, or a crust on her eyelids and lashes when she wakes up in the morning. Although it looks a little icky, it shouldn't be painful for your baby, and the best solution is simple: Gently wipe your baby's lids with a warm, damp towel or tissue. If the problem doesn't resolve itself within a few days, talk to your pediatrician, who might prescribe an ointment and instruct you to massage the tear duct in the inner corner of the eye. For some babies the problem lasts a while, but most blocked ducts will improve by baby's first birthday or earlier, according to the American Academy of Pediatrics.

Eye Concerns

What looks like a blocked tear duct could also be conjunctivitis, also known as pinkeye. Caused by a bacterial or viral infection that might affect one or both of her peepers, it's notoriously common among babies and has a yucky list of symptoms, including redness in and around the eye, and green or yellow mucus that practically seals the eyelids shut, particularly first thing in the morning. It's usually not a big deal to treat; your pediatrician will likely prescribe eye drops that will help it go away in a few days. But it is super contagious, so make sure to wash your hands well after you touch her face, and pop any sheets, blankets, or towels she's used recently into the washing machine to keep the infection from returning.


Returning to Work

If you work outside the home, you're likely approaching the end of your maternity leave—and dealing with the tumult of emotions that goes along with that. Some moms look forward to returning to work—not because they're anxious to leave their babies, but because they love their jobs and are thrilled by the prospect of chatting with other adults and shifting their brains into a different, non-"Wheels on the Bus," gear. Other moms get torn up about the idea of leaving their children with nannies or day care providers. They wonder, Can I trust this new person to care and nurture her as well I can? Will the baby love her more?

However you feel deep down about going back to work, you're almost guaranteed to deal with some guilt—which means you're just like every other working mom out there. So take it slowly and be accepting of yourself and your whole range of emotions. It is a big transition, after all, with plenty to worry about. Help yourself adjust to the daily grind again by devoting some time during your last weeks of maternity leave to call or e-mail some colleagues and get up to speed on on-going projects—plus get caught up on office news, so you'll feel more in-the-loop your first day back. Your first work day sans baby might be teary, but it'll get easier as time goes by. And the more you see how happy and cared-for your baby is with your child-care provider, the less you'll stress.

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