Thanks for your query,
is a common problem in children,
It is mostly due to dietary factors,but other conditions like hypothyroidism
,fissures needs to be ruled out.
I suggest you to give her plenty of fluids.glucose
water,salads,fruits,green leafy vegetables.
Decrease milk and milk products.
Give honey with lemon juice in warm water first thing in morning.
You can give laxative for 4 to 5 weeks if problem persist.
Wishing your baby good health.