DS is 6 months and 1 week and in the last week to 10 days has started being sick quite a lot, at least 6-8 times a day although relatively small amounts. He never used to be sick at all, or very very occasionally, and this seems to have coincided with starting him on solids a week ago. He is also really really active and spends lots of time on his tummy rolling over wriggling about trying to crawl - could this have an effect? Bit worried.