It's okay to feel this way. Although PPD could be contributing to it but most mothers and fathers feel this way in the first year.
Basically you replace all the energy you would devote to your husband with the energy you give to your child. It's just how we are wired and it takes a lot of extra energy to adapt to focusing on both. The reality is he should be your #1 focus.
Think of it this way you may have married him hoping he would change but he married you hoping you wouldn't. Motherhood changes you, even if it's a second marriage and your 2nd+ kid.
To start reconnecting with your husband start communicating with him. Don't use the same voice you use to keep the baby out of the Christmas Presents or get her to eat her peas avoid the voice you use to get him to take out the trash. Use that smooth calm but seductive voice that would call him at 2 am just to say that you were thinking of him.
Once you have his attention start with a division of labor. For instance: My husband deals with the boys in the mornings. This started with getting our older one off to daycare at a later time than I had to be at work, now he gets him on the bus and I don't have to get up until he and the baby get back. He presses their shirts and jeans, cooks breakfast and does the dishes.
When my husband gets home from work he sets the table and I serve the food which is ready. But when I worked a different job he cooked cause I arrived home later.
After Supper we get the kids to clean up after themselves but DH wipes the table. At bed time he handles the baths books and bed while I exercise.
There's nothing sexier than a man covered in dish or bath water.
He helps with the zones in the house. He does the kitchen and works with the boys on their bedrooms. He even helps with the laundry. My zones are Monday Kitchen, Tuesday Laundry, Wednesday Bathrooms, Thursday Laundry, Friday living room, Saturday bedrooms, Sunday outside.
Other than that there should be one night a week that is just for you two. get a sitter or drop her off at Playtime + then go out for face to face time. Dinner and activities that keep your focus on each other. No Movies or clubs with the newest band or comedian. Places where you can talk about anything but work and the baby.
It's a lot of hard work but it will build a better relationship in the long run. You just have to avoid the trap that says, "I can do this without him so why should I even listen to his complaints". The reality is Children are a product of the relationship therefore they should not come first. Older couples know this. It took me 2 other marriages to learn it but it really does help.
Now don't worry if this occassionally happens again. It's going on in my house right now because his work hours have changed and he's doing Santa Appearances on the side. But a strong marriage can survive a SHORT drought.