My baby turned 4mth the 29th I had her at 37 weeks gestation I know your not supposed to compare babies to other babies. However she’s not fully laughing she’s laughed once in her sleep but other than that it’s like a half laugh? And she’ll roll from her belly to her back but not back to belly, and she still sleeps quite a lot during the day especially if it’s a contact nap. I’m not sure if I should be worried or not… theirs other babies younger than her laughing and rolling. Thanks for any help!