Weight gain

Hello mommies. I just wanna ask sana if ano ang effective vitamins or technique pampagana kay baby kumain. Medyo mahina kasing kumain ng kanin si baby ko kaya halatang payatin din yung katawan nya. Gusto ko sana kahit papano tumaba sya. Please I need your expertise mommies. I am a first time mom 😊 Thank you in advance. ☺️