Does anal sex make your hips and bottom larger?

My boyfriend's sister and I are pretty good friends, so we're pretty open with each other. She has a four year old daughter and a one year old baby that she is breastfeeding. I have a few questions about that. 1) She said she doesn't get her period because she's breastfeeding. Why is that? 2) Are her nipples ever going to be normal again? I know that when a woman breastfeeds the nipples tend to look like bottle tips. 3) Should she have stopped breastfeeding her baby by now? He's almost 13 months. Thanks for reading!

Hey guys. I'm 18 and have really small breasts, I'm like a 32A, but I'm also only 5'3 and around 110 pounds. I got my period when I was 13 and my breasts have not gotten any larger. When I first got my period, I was around 135 pounds at my heaviest, but they were not any bigger then than they are now (I didn't go on a diet, the weight just melted away). I want to go on the pill to regulate my period because I still don't really get it regularly, however it is becoming more predictable. I was wondering if I go on the pill my breasts will get larger, because maybe since I'm not getting my period as steady as I should, and maybe it has to do with my hormone levels or something, if going on the pill will make them bigger? And what about helping with acne?(And my mom is a small B cup btw).
THANKS for your help!