2 month old baby hasn't been eating. I fed her usual 3 ounce at 130 (she eats every 2 and half…

2 month old baby hasn't been eating.

I fed her usual 3 ounce at 130 (she eats every 2 and half hours) & tried feeding her at 4 and has only been able to eat 1 ounce ever since.

She falls back asleep , could it be that she's just extra tired today?