A Week-by-Week Guide To Your Baby's First Year Milestones

Baby development and developmental milestones

2 week old

Fetal development by week: Your baby in the womb

One week my baby was sleeping well. Then she turned 4 months, and the next? Waking every hour at night, taking short naps, and suddenly impossible to settle at bedtime. We’d hit the 4 month sleep regression. At around 4 months, a baby’s sleep matures. Their brain shifts from newborn sleep patterns into more adult-like sleep cycles. This means: • more light sleep in each sleep cycle • more frequent wake-ups • more awareness of how they fall asleep It can feel exhausting and unsettling — especiall