No weight changes

Hey y'all!!

My munchkin, Madison, hasn't gained any weight in about five weeks. I am wondering if this is concerning.

She was 9lbs 4oz at birth (Nov '18) and has continued to be healthy weight. At her six month well child appointment she weighed 17lbs 6oz, approximately 77%. When I weighed her tonight it was the same weight, but she's now in the 55%.

She is a very healthy baby! I make her solids, which she eats twice a day. She is bf 4-7 times a day. She is an extremely happy and active baby.

Should I be concerned? Her next well child is in August.