Hello, it is very important to communicate with your baby since childhood. Even if the baby can't talk, you should communicate with the baby diligently. Explain everything to your baby, such as "It's time for your baby to drink water" and "Mom is back", so that your baby can understand your language and actions.

Guiding opinions:

I suggest you communicate with your baby more every day. You must build up your baby's language ability before he is two and a half years old, otherwise it will have a great influence on his pronunciation in the future. You can also go to a regular hospital to check your baby and let the doctor give targeted guidance to parents.

I wish the baby a healthy growth!

The above is a suggestion on the problem of "children can't talk for one year and nine months". I hope it helps you, and I wish you health!