Baby cant sleep at night

its normal for the 1st 3 month. my exprn my baby from 3 month until now 9 month not having any problem sleeping at night. 1st, let baby a bit hungry b4 sleep, not too long, ya.. then breast feed the baby and then, the baby will sleep when she/he full. i not using any cradle to make baby sleep.. just breast feed hungry baby 🤭🤭🤭