Here is what I think:
You spend all day long with the baby and even tho it doesnt seem as much work for you it actually is!!!! what you have to do is sit down with him and talk about it, tell him how you feel, tell him that when he comes home you understand that he is tired and wants a break, but hey when is he going to spend some quality time with you???
so in another words you wait all day for him to come home for you to spend time with him and all he does is sit in front of his pc? not acceptable.
This is what i did with my husband.
He loves video gaming so much that is actually what he is studying for, computer animation, and his excuse used to be that the more he played the better he knew about the world he is getting in to.
I got so fed up with this attitude i took all the cables for his xbox 360 and his 2 pcs, and hid them and told him he was not going to play until he started spending time with me and baby boy, that family time is not video game time and there started the rules.
now he comes home, gets on his PC to save his stuff or animation rigs from school, he actually eats dinner with me now, doesnt sit on his PC desk to eat or at leats not as often as he used to which was everyday!!!
Give him an ultimatum, you are home all day practically doing the hard job here which is raising your beautiful princess while he is out interacting with the world getting good nights of sleep and not even appreciating what you are doing cus raising a baby and taking care of a house plus a husband is not an easy Job, so tell him you need for him to start doing his part cus marriage is not a 50%-50% job but a 100% of each of you to make it work.
Boy have I been there and is no fun!!!!
I told my husband that from now on to get on his pc he had to make sure we had spent enough time, watch a show or 2, eat dinner together, talk about things, talk about the baby, and most importantly keeping a connection with each other, know how each of you feel about each other
When baby is taking a nap, take a bath with him is not necessarily to involve s-e-x but to spend time and relax, have a glass of wine even in the tub, it relaxes you, and can help for a more relaxed state of comunication between the 2 of you.
If you are tired and have not gotten much sleep the night before ask him nicely to help around the house, so you can take a nap and maybe help with the dishes if he is not a person that likes to cook.
My husband does all this things now but he only started doing them when i realized that he didnt know how i felt about him, so i told him and asked him that if he wanted for this to work he had to put a lil more effort in to the relationship more than his PC's.
My progress with him, yes he still plays, but i asked him to put his alienware up in the room unplugged (to save more energy for one which he did)and one pc was enough for him to do his stuff from school, and that if he expected to play a game, well he just simply had to spend more time with me first and then play if he didnt have any homework from school to do. Now he asks if its ok with mefor him to play Crisis for a bit on his PC.
I guess a friend of mine was serious when she said she was trainning her Fiancee (which is my Sons Godfather) and I guess trainning them actually works or at least make them see how things really are.
Remember comunication is everything and good luck, God Bless