My baby stopped breastfeeding at 3months Though she's 4months now.. Tried expressing but she Don't take it. She weighs 6.7kg but I'm worried..

My baby stopped breastfeeding at 3months
Though she's 4months now.. Tried expressing but she
Don't take it. She weighs 6.7kg but I'm worried..

Ideally, she should only be taking breastmilk and/or formula at that age but some cereals make cereal for 4 months