Can say short sentences
18-24 months old babies can easily say sentences of 4 or 5 words, and it is not a problem to master 30 words.
Learn to communicate.
Babies begin to learn real communication, politely wait for others to finish, then say what they want to say, and say different things in different scenes to answer simple questions of adults.
Likes repetition
Babies are keen to listen to their favorite songs and watch their favorite books and cartoons.
Use adjectives, adverbs and prepositions.
Mother should add adjectives, adverbs and prepositions to her speech, and try to make her baby understand with body language.
Never compare.
Different children have different language abilities, so don't rush for success, and don't blindly compare with others, which will destroy your baby's interest in learning languages.