Baby not eating in the morning

My baby girl hasn't been eating much in the morning. Last night she had a bottle at 9pm and only took 3oz and went to sleep. She slept all night woke up at 8am and only drank 3oz. Is this normal? I feel like after not eating for that long she would be starving. She has been doing this for sometime now. And most of her bottles during the day she doesn't finish. I'm losing my mind over it. I don't know if I'm just thinking too much into it. She seems fine but I just worry. She just turned 6 months on the 13th