We were told we only needed to bath every second day when Jess was a bubba as he's not rolling around and getting dirty or sweating or getting food all over him, so theres no need really to bath everyday, unless we wanted to. We started bathing everyday when it got warmer and he would sweat and i think it was when he started having big baths too.. so was about 1.5 months old maybe 2 months.. also as i started to set a routine for him then too.
He now has a bath once a day after dinner.. sometimes if we're going out and he makes a mess from his breakfast he'll have another in the morning which makes him happy as he loves them.