Lo is coming 5months. Still need to be rocked to sleep. Should i start sleep training ? or he will slowly outgrow it ?

I believe setting a routine Is the key. For both my children , by the 3rd month, they fall asleep without the need to be rocked or pat. They sleep through the night too. The bedtime routine is the same every night. Once the routine is established , they associate the routine with night sleeping and so they will doze off by themselves and sleep through the night.