17 Week Old Baby: The 4-Month Checkup and Vaccines

Your Baby at 17 Weeks Old

A 17 week old baby is around 4 months old — reaching, grabbing, rolling front to back and getting more vocal. Around this age comes the 4-month well-baby visit, where Canadian babies are usually offered a second dose of the 5-in-1 or 6-in-1 vaccine, the pneumococcal conjugate vaccine and the rotavirus vaccine, per the Canadian Paediatric Society. The CPS advises feeding or comforting your baby during the needle and not giving acetaminophen beforehand.

Your 17 week old baby is around 4 months — a fun, sociable age, and the age of the 4-month checkup. It’s a good moment to see how growth and development are tracking, and to catch up on vaccines.

This guide covers what happens at the visit, how to make the shots easier, and what’s normal this week for development, feeding and sleep.

The 4-Month Checkup: What to Expect

Around 4 months, most Canadian babies have a well-baby visit. Your provider will weigh and measure your baby and plot it on the WHO Growth Charts for Canada, check development, and answer your questions. It’s also when the next round of vaccines is usually given.

At this visit, the Canadian Paediatric Society’s schedule includes a second dose of the 5-in-1 or 6-in-1 vaccine (which protects against diphtheria, tetanus, pertussis, polio and Hib), the pneumococcal conjugate vaccine, and the rotavirus vaccine. The exact products and timing vary by province and territory — the Canadian Paediatric Society notes the timing for each shot may be slightly different depending on where you live.

Making the needle easier. The Canadian Paediatric Society suggests you can nurse your baby while they get the needle, and comfort them straight after. Ask your nurse or doctor about a sweet solution — a measured dose of sucrose, given a minute or two before the needle, which they can supply at the clinic. A topical anesthetic applied about an hour before can also help. Importantly, don’t give ibuprofen or acetaminophen before the shots — the CPS advises it doesn’t prevent the pain of the needle and could affect how well the vaccine works; these can be used afterward to treat a fever or bothersome side effects if they develop. Vaccines, the Canadian Paediatric Society notes, are very safe.

Your Life This Week: The Parent Experience

The 4-month visit can bring up worries — is my baby growing enough, developing on time? Your provider is there to reassure you and to flag anything worth watching. Bring your questions; no concern is too small.

The shots are hard to watch, but they’re quick, and your comfort helps enormously. Some babies are a bit unsettled or feverish for a day after — that’s a normal response.

The “baby blues” affect up to 80% of new mothers and usually pass within a few weeks, but postpartum depression can develop later — it affects about 13% of new mothers, and as many as 10% of fathers, and lasts longer, the Canadian Paediatric Society notes. If low mood, anxiety or a sense of disconnection is present now, please tell your doctor or public health nurse. You don’t need to wait and see whether it lifts, and it doesn’t matter how long it’s been going on — postpartum depression can begin any time in the first year. It is treatable, and getting help sooner makes it easier to treat.

Feeding Your 17 Week Old Baby

A 17 week old baby feeds on cue. The Canadian Paediatric Society advises feeding on demand — whenever your baby is hungry. Amounts vary a lot from baby to baby; for formula, follow the feeding chart on your formula’s packaging. Plenty of wet diapers, a content baby and steady weight gain show your baby is getting enough.

Around vaccine day, some babies feed a little less or want extra comfort feeds — both are normal. Keep offering as usual.

Solids still aren’t recommended yet: the Canadian Paediatric Society advises waiting until around 6 months. Until then, breast milk or infant formula meets all your baby’s needs. If breastfeeding isn’t an option, the CPS advises a store-bought, iron-fortified, cow-milk-based infant formula for the first 12 months.

A note on formula this week. Your baby’s fast growth runs on iron, DHA and vitamin D. The Canadian Paediatric Society advises an iron-fortified formula through the first year. MOF’s organic Stage 1 formulas, such as HiPP Dutch Stage 1, are iron-fortified and suitable from birth to 6 months, providing the iron, DHA and vitamin D your baby needs. Formula is a good choice whenever it’s the right one for your family.

Sleep at 17 Weeks: What’s Normal & How to Help

A 17 week old baby’s sleep is usually settling into a pattern. By 4 months, the Canadian Paediatric Society notes, most babies need three naps a day — morning, afternoon and early evening — with total sleep around 14–16 hours across naps and nights. Night waking still happens and is normal.

Vaccine day can disrupt sleep for a night or two, and some babies’ nights become briefly more broken around this age as sleep reorganises. It usually settles. A consistent daily rhythm and calm wind-down help; the Canadian Paediatric Society suggests keeping a regular sleep schedule as much as possible. Put your baby down drowsy but awake when you can.

Safe sleep reminder: always place your baby on their back for every sleep, on a firm flat mattress with a tightly fitted sheet and no loose, soft items, in a crib, cradle or bassinet in your room for the first 6 months. Keep starting your baby on their back even once they can roll. If you’re still swaddling, stop now. A swaddled baby who rolls onto their front can’t push up or free their arms — a sleep sack or fitted sleepwear gives the same contained feeling without restricting movement. Car seats, strollers, carriers, bouncers and swings aren’t safe sleep surfaces; if your baby falls asleep in one, move them to their crib, cradle or bassinet as soon as you can. Keep the sleep space bare — no bumpers, positioners, pillows, or infant nests and loungers. The Canadian Paediatric Society advises this lowers the risk of SIDS.

Rolling also means your baby may be outgrowing their bassinet. Check the weight limit on yours — most also say to stop using it once a baby can roll or push up on their hands and knees. If you’re moving to a crib, lower the mattress at the same time, before your baby can push up.