4 months still seems early to me to start on baby food. i think it's honestly just a growth spurt. my son did the same thing around 4 months, so i started trying to give him cereal (always do cereal and solid foods with a spoon, never in a bottle) but it really didn't do much to keep him more satisfied, so i went back to exclusive breastfeeding...which was tough on me. that goes through their systems quicker than formula, so i was nursing sometimes every hour!! but it subsided after a few weeks and then he was fine with just milk until about 6 months. to know if your daughter is ready for fruits, veggies, cereal, she should be sitting up pretty well, and her tongue should be able to move food back into her mouth, which is the opposite of what it does when they nurse or take a bottle. and she should be watching you when you eat, acting interested in the food. if she's not showing these signs, she probably doesn't need more solid food, and you may cause digestion and constipation problems starting food too early. if she does need more food, i wouldn't offer more than cereal right now. just give her more, and make it thicker, in a bowl, like consistency of cream of wheat.