My nurses gave me the evil eye when I reminded them I didnt tear in the hospital(they kept trying to give me strong painkillers dont like drugs and was in no pain after birth with all three), lol I had 3 kids without a tear too. sister in laws hate me. but my 2nd child's head was 90th percentile when she was born and it returned, and so did the 1st child with a 80th. Haven't really got back in the sac since my 3rd. between potty training my oldest(3), 2 sets of diapers and BFing I dont even think about it lol. But it goes back. btw My 3rd child's head was 25th, that was easy after first two.