@kimberlyyyy_the-preemie-mom, @mommy534 thank you loves , she eats about 3.5 ounces

ive always put 3-4oz in a bag

Oh. Well then add everything into one bag. That should be fine.

She's 3 1/2 weeks this is my first time pumping @kimberlyyyy_the-preemie-mom

Depends on how much your little one eats. If they only eat 2oz every feeding and you pump out 4oz you might as well separate it. If your little one would take the 4oz then put it in one bag.