help almost 4 month weird eating habit

alli • I`m 19 I have been with my soulmate for 2years and 9 months. we have been married for 11 months! we have lost 3 angels! Now were having a beautiful babygirl! Kasey Renee Smith
Anyone else's baby only eat 3oz bottles the first half of the day and the other half eat 5oz bottles?! She will be 4 months old in two weeks and has been doing this for a week now no matter what I do the first half of the day she will not eat more than 3oz