My little girl is 18 months and has never shown much interest in food. She is a very fussy eater and won't let me spoon feed her anything so I am forever trying different finger foods. She goes through days where she hardly eats anything. Most of the time she won't even open her mouth to try the food and other times she takes it and spits it back out. How can I encourage her to eat? Any advice on getting her to eat would be greatly appreciated as this worries me so much.