Yes they do get more painful with each baby! I was getting a lot a few weeks ago until I remembered to drink more water, and now they have virtually vanished (to my surprise.) I'm just drinking a lot (of water, that is! LOL), not doing ANY heavy lifting or stretching, and spending time in the pool every day. Also I have a terrific pregnancy sling that goes from my shoulders, over my back, under my pelvis, etc., and that helps enormously! Complicated to put on when you're sleepy, but terrific. Anyway, who knows....maybe BH contractions also have to do with how the baby is lying in there and what direction s/he squirms in! It makes me laugh when my 2 1/2 year old asks me to carry her upstairs...I'm like, yeah, right, Mommy can barely get herself upstairs, are you kidding??
Wishing you all painless BH!!