10 month old self weaning

My daughter was breastfed from birth to about 4 months and then she went to formula. She is now 10 months and I've noticed this week she has gone down to 2 8oz bottles a day and her morning bottle she drinks maybe 4oz. She eats a lot of veggies and fruits in between and I always offer her a bottle before solids but she has no interest. She's 23lbs and super healthy. Is it normal for 10 month olds to self wean this early? My son didn't wean himself til around 12 months. So I'm curious if I should call her pedi or stop being a worry wart. 😃