My LO used to be able to take a bottle just fine as recently as three weeks ago. She took a couple last weekend when I had to be away but it was a battle. The doctor recommended trying to get her to drink one every night to get her used to it but we've tried everything and she just won't take it. This is an issue because she gets upset when I'm away for more than 30-45 minutes (like for my doctor's appointment Monday). Any tips?