marriage feels like its dwindling

So im 4&1/2 pp with my 3rd son. Lately i feel hubby and I are like roomates if that makes any sense. He helps around with baby and house but i feel so disconnected. Almost every night im in our room with baby watching tv or on my phone while he's on his or laptop in our office room. I've voiced it to him and it gets better periodically then back to this. I miss joking, laughing talking to him, we are intimate not so often. We are in our early 30s, i feel like we should be in the clouds with life and lovey dovey. AM I THE ONLY ONE? How long does this last.......