My dd is 7mo and very active, pretty much crawling...she does a commando type crawl. She is ebf and blw. At night we often feed lying down side by side or we do cradle hold tummy to tummy like we've done since she was a newborn which is comforting.
However in the day she is often quite distracted and wriggles like crazy during feeding. She will take a whole feed but likes to wave her legs around, whacking the other boob with her feet and waving her arm around whacking my face and boob. 
Just wondering really if you fed in different positions as they got bigger or more active and if that helps?