SLEEPING BABY

hello ladies, my baby is about to be 4 months and just right now i was putting him to sleep. his eyes were closed but then they opened and stayed open for like a good 5 seconds but he looked completely out of it. i checked for his breathing and he was okay! i wanna think this is normal bc he has NEVER done this before. and mind you, he hasn’t slept very well throughout the day so he could be overly tired as well. i’m a first time mommy & literally everything scares me🥲