Baby Choking During Feeding

I need help and I have been afraid to ask. I use Avent bottles currently. My daughter eats 2.5oz every 2-3 hours and every time she eats she gasps and chokes to the point where she is coughing. She will groan and gasp and moan the whole feeding no matter what position she lays in. She is only 10 days old so I was assuming it is just her learning to breathe and suck & swallow, but it is so disturbing for me. What can I do to help her? I am open to buying new bottles and trying new feeding positions. She is fed breastmilk when I pump by bottle and she also breastfeeds from time to time with no choking. I have heard about Dr Brown's Preemie Flow bottles. Are these worth a try?