Discouraged Mom, not eating baby.

Within the past month and a half I noticed that my son does not want to eat anything except for rice now he only wants pedicure for breakfast lunch and dinner and of course I don’t allow that but sometimes I have to give him 2 a day because he’s not egging. It’s losing weight but his getting taller and according to the doctors appointment last week he’s gain 5 pounds since January but I feel like he’s not starting to really lose weight idk what to do

He use to love to eat. Now not so much and it’s making me really sad ☹️