Babies can usually speak when they are about one year old.
Generally, babies can laugh out loud when they are 3 months old. When they are called their names at 6 months old, they will be able to respond. By 7 or 8 months old, they will be able to laugh. Unconsciously pronounce some dada and mama sounds, and can express welcome and goodbye by 9 months.
At about one and a half years old, the child can consciously call mom and dad, and can also speak some other simple words. At about one and a half years old, the child can speak some simple words. Between one and a half years old and two years old, most children can Children can speak some simple sentences. The language development of 2-3 year old children has been further enriched and they can speak some children's songs and relatively long and complex sentences.