Speech Development

Hi sisters my son is 20 months old and all he can say is "ate" or "atay" means tatay and at rare times is "mama" (kung sino pa ang lagi nyang kasama) hindi pa siya maka recall ng letters numbers or he even can't say his name pa. medyo worried ako kasi almost 2 yrs old na siya. His father is an Arab and I think maybe this matters kasi Arab babies more on movement and they speak later on. Still i want some advise. for a 20 months old, ok lang ba ito? thank you #advicepls #pleasehelp