How helpful is your partner?

Our lil girl is now 5 weeks, she was 4w early so she should really only be 1w. At 1st DH was so wonderful and helped me a lot and we supported each other! But now he does barely anything, he doesnt even offer to help any more :(....  I know im the mum and i feel its my duty to fill bubs needs, but i could use a break at times at least to  have a quick nap. I dunno why his like this.. I know he may be tired but we both are and he doesnt help through the night and just sleeps now so i dunno maybe the novalty has warn off... Anyone else going through this?