Baby not sleeping at night

Cindy💕 • 18, mummy to George 31/07/16👶🏻💙 fiancée of a amazing man 5th Jan '16💕
My 3 week old baby will sleep absolutely fine in the day but at night he just refuses, I make sure he's fed, winded and changed and then as soon as I put him in his Moses basket he starts crying and he just keeps crying, how can I get him to sleep, I'm surviving on about 1-2 hours a night atm