Need help! New mom...

Hello!

So my baby just turned 6 months old. I started her on solids at 5.5 months with permission from her pediatrician .. I started with puréed root vegetables for 3 days each then started to combine them. Recently I started apples and pears, as well as giving some water. My daughter is constipated. I feel like I'm not giving her the right food I feel so lost and I feel like it's my fault she's constiapted. :( I don't know what foods to give her everyday for lunch. It's so stressful