We have been doing a mixture of bf and express/syringe feeding to deal with this as mr riven did the same thing...
We were given a three hourly feeding plan as Riven wasn't sucking properly once latched on, he got the latch every time just not the sucking part, he has now got the sucking part so I am changing his plan lol..
We got him doing this by putting our little finger in his mouth with the nib of the syringe and we push the plunger when he sucks so he gets milk if he stops we stop, that way he gets rewarded for sucking and it seems to have worked.
At the moment I feed him when he wants ( which isn't often as he sleeps a lot still) and then when we get to the three hourly feed dependant how much he has had in that three hours we feed him by syringe a certain amount. Not a fool proof way of doing it but it ensures he is fed regularly with something and he has started letting us know when he has had enough too so I don't think it will be long until we can drop all syringe feeds too yay lol
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