Bottle problems

So my daughter is the sleepiest baby ever. Since she sleeps so much she wakes up and tends to cluster feed, this is making me over produce, I pump in the morning after her feed and before bed to start stashing some away and to ease that overly full pain. Well every time I give her a bottle it’s a struggle, she’s 2 weeks old and until yesterday she threw up if I gave her a bottle, yesterday went better but she still struggled. By struggle I mean she lets it run down her chin, she struggles to catch her breath, I pretty much let her sip a few sips and pull the bottle let her breath, sip a few more sips. We are using the medela bottles, and we have tried the tilting the bottle lower and flatter method. Is it just because she’s only 2 weeks? Is it the bottles? Any suggestions on how to help with this? My son never had any problems using bottles and it’s the same bottles we used for him, I can’t remember when we started using bottles for him though, so maybe it’s an age thing?