To pick up on citybranch's point about parenting extending beyond toddlerhood, I don't intend to just be there for my dcs in the first few years of their life.
I intend to be there for my dcs their whole life, god willing.
Parenting is for the long haul, not just the nice cuddly 'formative' first 5 years of a child's life, which nicely tails off with them going off to school, in most cases at the state's expense.
That to me means putting in place a robust structure that can cater for more rather than fewer eventualities. These include the fact that children need the emotional support of their parents more when they are schoolage (yes, you know, that's is true), rather than toddlers, I might get divorced (pruneplus2, you are doing a great job) or widowed or dh/I lose our jobs or are unable to work, dcs need help with uni fees or to set up a home. I am sure there are many more.
By always keeping my hand in, I am building up a nest egg for future. This allows me to give up work if necessary and take any knocks that life dishes out with little impact on my dcs' life or standard of living.
Guess what, my dcs still seem to have no problem recognising me and dh as their parents and for most part, indistinguishable from the other well-behaved occasionally naughty children they play with at school/nursery who had SAHM in their early years.
Dcs of WOHM/WAHM/SAHMs mostly end up at the same place anyway, if from the same socio-economic strata in society. As a WOHM, I have to put in more effort to organise my time and juggle to get to that same place for my dcs, but at the same time also have this comfy financial buttress of marketable skills, reduced mortgage and options, such as giving up work later.
I take all this on myself with the long term in mind. It would be so easy and simple to just give up work and devote myself to childcare and housework. But I can do both and more and actually, quite enjoy it!