I'm a SAHD to a 14 month old. We're fortunate that because I'd more or less paid off my previous mortgage before I met my wife we can get by on one salary despite moving and taking on another mortgage. I know, deep down, that many parents would sell their souls to the devil to be in my position, and that the time I get to spend with DD is priceless, can never be given a second go, and can never be taken away from me.
In reality, there are three things which gnaw at me. First, it's bloody hard work. We moved to an area with no established support network and a long commute for DW and I find day-in, day-out utterly exhausting. All day without adult conversation is much more daunting than it ever sounded.
Second, I hate the fact that we're now totally dependent on my wife financially. I know that I'm contributing in different ways, but decades of being conditioned to be the breadwinner don't go away overnight, and many of my family as well as a few friends are very judgmental about it.
Third, it serves as a constant reminder that the reason I'm a SAHD is nothing to do with choice but everything to do with my complete inability to find work of any description, never mind something meaningful and commensurate with what I can offer. I have 15 years experience in senior management and an MBA - at the risk of sounding both callous and arrogant my brain is far better suited to doing other things and paying someone to look after DD with the proceeds. I can feel my workplace skills rotting away by the day as my experience becomes staler and staler, and every week that goes by makes returning to work feel further away than ever.