I'm on my third generation and I've found that it takes about a day to age up a child of any age, IF you complete the daily family events with them. An icon of parent and child stick figures appear above their head to when they're ready to do the event with you.
anoymous
Weeks are long
anoymous
It’s been a week
anoymous
A rough two days
For my
Kids
anoymous
I’m not quite sure, it could be random, but my baby aged 3 days after he was born...
anoymous
Ummmm..... This might be right but it might take a day
anoymous
To go from a baby to a toddler it takes about a day if u play a lot, then to get from a toddler to a kid it’s the same amount of time
anoymous
I play on the game regularly and my baby took about 12 hours to grow into a toddler so tbh I think it depends on how often you play the game