Not healthy at all man...Thats just bad and its not ok. You sound like a good, healthy, and passionate guy. I would consider some couple's counselling. I was a bit depressed with my ex when I only got it once or every other week. Made me feel unloved and unwanted. It was not for a lack of trying either and no I didn't expect her to turn on light a light, rather I'm all about intimacy and having that emotional connection too. You can only get turned down so many times before you give up, get drepressed, and begin to resent her.
Sometimes people have TOTALLY different sex drives. Women can sex the hell out of man when they are courting and then once they have them bam....you are a sex ration. I understand you guys have a kid, but you still need time on a regular basis for both physical and emotional intimacy. I would talk to her openly about it, tell her what you need, seek help, and if she cannot change you will have to leave her as this is no way to live.