When DD was newborn we were told by HV to bathe her every two or three days. She is now 7mo and we have been bathing her every other day for the last 5 months or so.
I think she should have a bath every day now but DH doesn't agree. Other friends seem to bathe their children daily and I get the impression that DH is trying to limit it to a bath every other day because he is the one who has to bathe DD and he gets home he late so it's a hassle for him and he'd rather not have the responsibility every evening.
(We have agreed that when I stop BFing she will definitely have a bath every night before bed as part of her bedtime routine. ATM, she goes down really well every night with a bedtime breastfeed.)