For those experienced in motherhood, about when would be a good time to introduce a bottle? My mother-in-law is surprised that we haven't done it yet, but my DD is only 3 weeks old. I know if I want to go somewhere for longer than an hour or so and have my DH feed her, I need to have some breastmilk in a bottle; but I'm afraid of her getting nipple confusion. I don't want to start too early. Thanks for any advice!