At 7 1/2 months, it wouldn't surprise me at all if your DS refuses a bottle. An older baby never needs to use a bottle. You can offer milk or whatever in a sippy cup. And if you're only missing one nursing session on an occassional basis, you might never need to offer pumped milk. He could eat solids instead. He won't miss out on nutrition if it's only once in a while. Or you can plan outings for when he already gets solids or is likely to not ask to nurse for a while.
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Pumping is a learned skill and your body doesn't have all the wonderful cues to let down with a pump (it's not soft and cuddly, doesn't smell good, makes strange noises. . .). What have you tried? Some things that might help:
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Pumping on one side while nursing on the other - this way your DS stimulates your milk letdown and the pump just takes advantage of it. If/when he wants to switch sides, simply switch baby and pump. Your nursling is way more efficient than the pump, so he'll still get milk from the side you pumped first. And you'll get to take advantage of another letdown (but probably won't get a lot of milk since DS already nursed on the second breast).
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Pump regularly. Since it takes practice for your body to respond to the pump, if you only try periodically, your body might not respond. If you can try to pump briefly at the same time every day, you might find you're more successful. Most moms find milk supply is highest in the morning and it's easier to pump a little extra milk.
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As already suggested, hand expression. If you leak from the opposite breast while nursing, this is a good time to try expression. Or try a good-quality hand pump (Avent Isis). These work better for some moms.Â
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If you're truly getting nothing with the pump, it would be a good idea to have it looked at, at least by an experienced pumper. Perhaps you have something hooked up wrong, or some of the valves need replacement. A pump retailer can test the pump motor for you (don't tell them it's a used pump ;-). If you're getting only a little bit, remember that it's not abnormal to only pump 1/2-1 oz if you're nursing first. You can combine milk from different pumping sessions to have enough to supplement your nursling when you're not home.