Baby Sleep

Hi,my baby turned 3 months old last week. Suddenly he's sleepy , he's sleeping long stretches at night like 6 hours (I wake him up for feed) and then another 4 hours. This is a new pattern and my anxiety is on another level. He never slept during the day properly but now he's sleeping 3-4 naps during the day too.

Also going through the 3 month milk strike .

Did your babies suddenly start sleeping like this at 3 months old?