I haven't read the other replies so hopefully I'm not repeating anything.
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First, relax. Going back to work is stressful and hard. But your baby's gonna pick up on your stress too. I think most bf babies would rather have mom than a bottle. But if mom's not there, that bottle might not look too bad. My youngest wouldn't take a bottle if I was even in the house. Without me around, he'd take a bottle, though it never was his favorite thing.
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My first day back to work after I had him (he was 6 weeks old), was rough. But we both got used to it and it ended up being ok. He did reverse cycle, which worked out fine for me since I couldn't pump much anyways. And he got to where he'd take a bottle or two a day. He did eventually start sleeping all night and drinking all his bottles during the day as he got older.
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If you can go nurse on your lunch break, that will probably help ease you both into this. Good luck, you can do this and you'll both be fine!