Hi All! I have just weaned ds2 off the boob du...

Hi All! I have just weaned ds2 off the boob during the day and am wondering if this is normal? On the tin of the formula it says 180ml is how much they should be drinking... Well ds2 will struggle to finish off that bottle in 2 hrs in the morning and most of the time thats still about 60mls left and then his 2nd feed in the afternoon he almost finishes 120ml.. Is this alright or should he be drinking all of it? I'm thinking that he would have never had that much during a breastfeed and that could be why?