Playboy and soft porn have a lot to answer for. Boobs are so sexualised, that to breastfeed your child is to abuse your child in some places. The sight of a baby sucking on a nipple works people up into an indignant rage, as if you are doing something sexual / inappropriate to your child. Thus mothers are wary about breastfeeding, some cannot get past their breasts being sexual objects, fathers with a big breast fetish don't help with their comments, and prudish relations make the mother so uncomfortable she won't even feed in her home let alone in public. So babies miss out.
Here's my video with thoughts on the subject. Less of a rant in the video, more encouraging first-time mothers to breastfeed despite the obstacles. I also discuss "extended" breastfeeding, which, to put a name on it, makes it a "thing" and makes the person doing it somehow abnormal.
It's not abnormal. It's normal. It's so normal it bores me having to talk about it, but I feel I need to spread that word a bit, because everywhere I go everyone I meet treats me like I'm doing something abnormal.