Baby spits up a lot (milk & some solids meals) - has always done this but thought it would stop by now. Doesn't really drink much water (tried lots of different cups). GP says nothing obviously wrong as baby seems healthy and thriving, but it doesn't feel right (& the amount of washing is crazy). Intro'duced all allergens and don't think it's that, doesn't happen more/less depending on what's eaten. Any ideas?