Slow day of eating??

Is it normal to see my baby have a really slow day of eating?? So far today she’s having really small bottles of milk and drinking almost 2/3 of what she would have had yesterday. She just fed an ounce from the bottle and fell asleep again. Not sure if I should be worried or if it happens sometimes. She has a great amount of poos and pees so far today!

Example yesterday she had about 26 ounces of milk all day and today were like 25? She was doing like 3.5 ounces and today she’s doing like 1.5 and really falling asleep.