We wash Mackenzie's hair once a week and just wet it if need be during the week to get the sticky food out!. I do it by lying her back like she was when she was a baby (she's now 14 months old). She loves swimming and will put her face under but isn't a big fan of having water poured over her head in the bath so this seems to work well for us. I have also seen in magazines an item which looks a bit like a head band which goes over the head and sits where a hat would sit on your head. It sticks straight out so stops the water from running on their faces when you pour the water on.