semi solids

Hey mommies,
I have started semi-solids for my 5months old baby since Saturday. Until now, she had only say 2 baby spoons of carrot purée. Today she didn't eat all and she was pushing the spoon with her tongue. 
Also since 2 days she is pooping 3 times but the amount gets reduced as the number of times. I am worried she will not gain already she was only 5.6 kg as on june 12th. She is completely on formula now 
Expecting for some suggestions 
Thanks