Should i wake my three month old baby up for feeds? He is starting to go 4-5hrs btwn feeds (mixed breast milk n formula milk). He used to feed 2-3hrly.

3 months is when baby is adjusting sleep patterns. If Baby is gaining weight well and doesn't seem to need the feed, it should be fine to let baby sleep. However, if baby is losing weight or weight gain is stagnating, you may want to consider waking baby up to feed more often.