Maybe a tongue tie that developed after. It is best to see a lactation consultant
See a lactation consultant asap. I like Lucy Webber Also, look at her posts on different aged babies (in highlights) https://www.instagram.com/lucywebberfeedingsupport_ibclc?igsh=MWc5czlueHg3Z3Zycg==
Following because same. Only latches perfect when side laying now