I confess I am rather gobsmacked at this thread.
I fully agree that baby time is precious and quickly disappears but we are "only" talking about 4 hours a week for a very good hourly rate of pay.
What's more, the child will be with the other parent (what could be better?) while you are working as opposed to a "stranger".
I would kill to be able to earn £560 for just 16 hours work in each 4 week period.
I am in the impossible position of being unable to work "normally", eg. "9 to 5" as once travel & childcare have been deducted I would be working for an absolute pittance AND, my toddler would be in FULL TIME childcare with a "stranger".
However, we do desperately need the money, so instead I work practically EVERY evening and weekend (totally anti-social hours - I have no me time, let alone "us" time) after being a F/T SAHM, for LESS than the minimum wage (.... but apparently, according to the powers that be, that's ok because I am technically self employed).
On average I do more than 40 hrs a WEEK to gross LESS than you'd get for 4 hours a week !!!
Ultimately of course this is YOUR choice and whatever any of us think you have to square how you feel about leaving your child, even if with their father and for a very short time.
However, FWIW I think you are in a very fortunate position and just 4 hours a week out of your baby's life probably won't even be noticed by her. I appreciate the time I spend with my toddler during the week but am totally angry/frustrated/feeling trapped in a Catch 22 by the fact I cannot afford to stop working weekends and therefore cannot enjoy family time with my DP and OUR daughter ...... as is he .... how can we have a relationship when one of us is always working ?
Oh - and I have a 1st class degree for all the good it's done me.
Now I may have just carried away a bit there and apologise if I've ranted, you of course are not responsible for my circumstances but I cannot help feeling when I read a "dilemma" like this that you are looking a gift horse in the mouth, all things considered.
I know I am not the only mum who really has no actual choice at all about whether she stays at home or works. There are probably many 100s of 1000s of us who are damned if we do and damned if we don't one way or another. It strikes me that you either have to be earning a very good wage to make it worthwhile returning to work, or, you have to have a very low household income so you qualify for help with childcare.
At the end of the day I suppose you have to assess whether or not you can live without the "great help" this extra money would bring, or whether it is actually essential (like my insulting pay is).