Most probably its growth spurt. 
Make sure u burp her well after feeding. Gas could b one possible reason too.

Babies do that sometime.. my daughter was small when she did it once.. she was just waking up to eat and.then again sleep.. let her sleep how much she wants to

Today i fed her in lying position due to backache, i did'nt burp her.

Hi 
It's a growth spurt too.... It would change.. 
But make sure the baby is not colic. Burp your baby after every feed well. Don't put the baby flat on the bed immediately after feeding. Sometimes it's just for attention they cry... Make sure you make the bed cozy.

@5f6e0b33c0de03004572c596

Revauthi Rajamani

Hey my baby is 2 and half month old, today she is bit fussy and also sleeping lot. Otherwise she use to take nap for 3 to 4 hrs and use to play but today she is sleeping lot and whenever she is awake she is crying since till now her pee count is 6. Any reason ???