When to start a routine

Susan

Hi all, I'm just wondering when the best time to start a proper routine woth my baby is? He is currently 6 weeks old but was 4 weeks early so I feel is still playing catch up developmental wise. He sleep on and off during the night and every few days will have a complete meltdown and not sleep for hours so I was wondering if a routine would help this? Anyone got any suggestions on where to start or where to find some information about implementing a routine? Thanks!