I would also cut back on solids. Milk is far more important at this age. Is there a reason you weaned at 4 months? That’s very early abs it’s very difficult to get the same nutritional value from solids as you get from milk.
My 6mo will not take a full bottle of milk, we started weening him at 4mo, he has his 3 meals a day but now even in a morning or his bedtime bottle won't take more than 2-3 oz? We are adding his milk into his meals to keep up his calcium, but is there anything else we can do? Is him effectively weening himself off milk so early ok?