Sit him down and make a list - allow for the fact that when you are not at work you are looking after your LO as well. It will only get worse if you don't read him the riot act now. It's entirely up to you how you divide chores in a relationship and if someone wants to be the Housewife while a partner goes out to work then that's up to them, but that doesn't sound like what you have signed up for.
I'm not working at the moment and DH is full time, the MD of a £100m turnover business. When he is in a busy patch I will pick up more of the chores, and on a day to day I do more, but I still expect him to cook from time to time, to wash up when I cook, to empty the dishwasher, and to help out around the house with various things (taking the bin out etc). He mows the lawns and does all his own ironing. Martha is at pre school four mornings a week but allowing for the fact that DH leaves at 8 and is rarely back before half six, my working week is as long as his!
He baths Martha on the nights he makes it back in time and takes turns getting up with her in the mornings, including weekends.
He also does all the shopping online. When I go back to work, we will need to have a chat about the washing..........
Sometimes things get out of whack a bit (like with the cooking, he hasn't really been cooking recently unless its to heat something up out of the freezer) - I then point out to him that's he's taking advantage and he will make more of an effort.
Seriously, these things eat away at a relationship if you have a perceived sense of unjustice. Read The Pile of Stuff at the Bottom of the Stairs, and don't ask me who just emptied the dishwasher in our holiday cottage

Oh and failing all else, try to steal Kirsty's DH