My LO is 8.5 months old and has been doing this since she was 6 months. I was extremely worried and took her to see everyone. Her Paediatrician explained to me that as long as she is eating and drinking water well and that she is developing normally, not to worry at all. He also said that self weaning is only usually an issue when neurological issues are at play where a child is unable to feed themselves. Hunger and thirst are survival instincts and your LO will be getting all they need from solids. This was told to be only 3 days ago so pretty current. I'm no longer an absolute mess about my baby refusing milk feeds. If you worried, maybe go to you GP?