Baby is only in 8% for weight 😔

Every other appointment she has been 45-50% for weight and today we found out she's actually lost a few ounces since her 4 month check up. She eats consistently, but not a lot. She's still averaging 4 oz. Every feed, about 24-28 oz. A day. She loves baby food since we started that so doctor encouraged us to add in oatmeal and rice cereal but I'm still worried. Has anyone else gone through something similar? Just looking for words of encouragement.