Language development is slow, and the most important thing is to talk to more babies and encourage them to talk. Secondly, people who mainly take care of the baby in daily life should treat the baby as an adult. Don't guess what the baby thinks, let the baby say it. For example, if the baby wants something and he points at it, we will pretend that we don't understand it and force the baby to say it himself, even if he says a word "want" or a word "take" to encourage the baby to make progress. If the caregivers can't do this, it is also effective to send teachers to teach early education, but after all, early education is only 1 or 2 hours a day, and the remaining ten hours are imperceptibly attended by caregivers. Once the baby is used to expression, he will find that talking is much more efficient than gesturing or "mmm-hmm".

I used to talk to my 1 month-old baby like a psychopath. Fortunately, my baby spoke early and speaks very well now. At the age of two and a half, he can talk back to me.