Start on solids

I'm kinda of worried.My LO just started to solids this few days and the milk intake dips.From total intake of 650ml dip to 400ml.What should I do?I tried to force feed my LO to drink but she refused.And suddenly there is change in her sleeping pattern.Now she is deep sleep from 2030 onwards and will refused 2100 and midnight feeds.She refused to be dream feed now.