Not taking feed

kukku

My baby is 11 weeks old...she is not taking any feeds...she cries with back arching of I try to feed her...completely normal between feeds ...pees more than ten times...this started this week...is it a developmental milestone...she is also making bubbles with saliva...she is just running on fumes...she takes just 20 or 30 ml and does not demand any feed ..

Only cries for sleeping...