A trivial matter really but it occurred to me to ask how often you wash your lo's hair? I am a bad mum that only washes ds and dd's hair once a week. This is perhaps okay for a boy who hates hair wash(he's nearly 4). But my dd is 18mo and if she's going to have longer hair am I going to need to plan for frequent hair washes and conditioning treatments like I've seen some of my friends do with their older dds?! (We are really bad, as we've had the same bottle of shampoo for some years!!!)