How do you put a baby to sleep without milk?

He’s allergic to milk and won’t drink any alternatives and any bottle. I have literally tried all the milks i could get easily and and tried them all in different bottles and he won’t take anything.

He’s a year and 5 months.

Was breastfed up until now

I’m desperate for help as he wouldn’t take anything else and won’t sleep without feeding.

I’m currently 3 months pregnant, with HG and High risk. I tried to stop feeding him earlier as it gave me cramps and pains and i was advised but it didn’t work out. Thank god the baby is safe and well still.

Because of my HG I have now started to be low on milk earlier than expected (which I’m okay with) but he won’t sleep now won’t take his naps etc.

I try giving him water he does drink a bit of water but not enough to be sleepy or go sleep afterwards.

I’m so lost i have no idea what to do now please someone help. Is there any way to get him to sleep without drinking? And if so .. how! Don’t know what I’m doing wrong.