9 day old eating often

Haley

My 9 day old has gone from eating an ounce every 2-3 hours to eating an ounce every hour today. Should I up it to 2 ounces per feeding? I don’t want her to eat too much at one time and end up spitting up or with a tummy ache. Btw, she’s bottle fed. Alternating formula and breast milk.