With my 1st, 3rd and 4th pgs I had a more pointy looking belly - certainly not a nice round ball - more of an egg shape LOL. With my 2nd pg I had a lovely round shape, but this was the pg where I gained the most weight (27kg) but I wasn't as big as I was with the other 3 in the belly - it was just evenly spread out over my body. I also tend to carry quite low too - but all of them were out in front kwim? I think my shape was determined by their length - 1 3 and 4 were all really long (56, 57 and 59) so they would have needed more space in there to fit I suppose, but my 2nd was my shorty (52) and could curl up smaller in there. For the record 1 and 4 were boys and 2 and 3 were girls