My friend (who's baby is now 13 weeks old) started mix feeding at about 1 / 2 weeks cos baby had lost too much weight (can't remember how much) and mw and hv were saying they would have to admit her if she didn't gain x amount. She managed to get her gaining weight steadily and avoided going into hospital again. She was very torn and unsure about it all but it has turned out great as she is now gradually reducing the volume and number of top up formula feeds and baby is still gaining weight and following along the same percentile line. Baby is strong and happy and hasn't caused any nipple confusion for her.
One thing she did find though... After a few weeks she swaped how she gave the feeds so she actually now gives the bottle first and then the breast. Although this seems counterintuitive she has found it works great because before she felt baby wasn't really working very hard at breast with the safe knowledge that she'd be getting a bottle afterwards! Now she polishes off the bottle first and because she's still hungry she latches on and does a really good feed as well, so over all seems to be drinking a lot more this way than before (although hard to know for sure I guess) and is finishing very satisfied as the breast milk is endless so just keeps going until full. I'm not sure this is what the health care pros would suggest but thought I'd mention it cos it's certainly worked for her.
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