FirstWeeksYour baby at 57 weeks: fifteen-month runway
Medically-informed · Sources: CDC · Updated June 2026
A growth-and-skills push toward 15 months: bigger appetite days, new words trickling, and the 15-month checkup on the horizon.
What’s happening
The word count climbs
Commonly 3–10ish words by 15 months with huge normal variance — plus 'jargoning' monologues and reliable gesture communication.
Following two-part life
'Get the ball and bring it here' starts landing — memory holding two steps is new machinery.
Checkup preview
The 15-month visit: growth, milestones, commonly another vaccine installment per schedule. Book it now.
What to do
- Book the 15-month visit
- Play fetch-style two-step games
- Keep the first-words list growing — screenshot it for the visit
When to check in
Loss of any words or skills previously had — always the same rule: call, don't wait.
This is exactly what FirstWeeks shows you — matched to your baby
Week 57 guidance, skills to watch, and answers that know your baby’s age and log.
