Im 24 weeks and my belly button is still in but looking flatter than before haha. My MIL keeps saying it will pop out soon. Around which month did it actually come out for you all?
Mine popped out around 7th month when the belly got really stretched. It looked so funny but went back to normal after delivery. Totally normal thing dont worry.
With twins mine came out super early, like 5th month only ha! Belly was huge. For single baby usually third trimester it pops. It goes back in later, nothing to stress about.
Usually third trimester when uterus pushes forward. Some women it pops fully, some just flattens, both fine. Mine was different in each pregnancy actually.