We had a very similar experience with our first, but my wife persevered to the point of madness and excruciating pain. Our second also failed to latch properly, and despite numerous nurses and doctors saying it’s her doing it wrong we went straight to combination feeding with a pump.
Anyway, nine months in and this week we notice BOTH children (9 month old and 4 year old) have a top lip tie, which causes every problem we experienced. It seems the nurses were more intent on telling us we were wrong than they were on finding a problem. It only became apparent because his teeth aren’t through properly, his brother’s isn’t so bad