14 months old baby doesnot talks only says amma but understand everything what should i do

A. See the best part in your question is that your child understands everything that is the most important thing at this age and speech can happen by the age of two years to 2 1/2 years so it’s not a delay try to talk to your child more and more do not give any screen time to the child the more you communicate things are going to be better over the period