Baby eating less in the morning?

Michelle

My baby will be 3 months on Friday. She used to drink 4-5 ounces, consistently every 3-4 hours. Now, lately she seems to treat her bottle like a buffet and just does whatever. She is only drinking about 2 ounces at 9 AM and NOON. Then at 3 she wants closer to five and at 6 and 9 she wants 6 or 7 ounces She usually wakes up around 1 or 2 and then again at 6 and drinks 5 ounces again

Is it normal for her to be so irregular?