hi all my 9 week ds was having some weight issu...

hi all my 9 week ds was having some weight issues and i was advised to supplement him and have done one bottle in the evening but over the last 4 days he is refusing to go to me through the day but feeds perfectly through the night. Now during the day he will simply scream and no matter what i do he will not go to me i have tried to feed him in my bed in the dark so its like night time with little success, ive been told to keep persevering as he isnt nipple confused as he feeds well at night but in persisting how long do i let him cry for cos im at my wits end i despratly want to feed him but have no idea why he wont feed during the day i need some help please