Dd2 outright refused to do anything other than breast feed for a long time, at 9 months she picked up dd1's milk bottle and then weaned and only wanted cows milk but still refused solids she turned her head and closed her mouth until about 12 months when she started on finger foods like carrot sticks, pasta she loved it. Some babies just aren't interested, solids aren't a big part of their diet until 1 unless as others have said they are losing weight which was the case with dd1 who was on solids at 4 months.