difficult feeding to a toddler

Hello momshies. I have 21months old baby girl. Pahirapan sya pakainin. Hindi naman sya pihikan pero pahirapan lang. 3 to 4x a day ko sya pinapakain at kulang sya sa normal weight for 21 months old baby. Everytime pinapakain ko sya, most of the time linuluwa nya. I tried different approach, pinapanuod ko sya ng nursery vids, lend her my cp, or minsan napapagalitan ko na. Naranasan nyo rin ba ito? May mga advice or suggestion ba kayo? Thanks.