advice needed

So i have the option of staying home once baby is here ( not until january) or going back to work. I nanny so i’m a little cautious of going back to work bc im going to be a first time mom and i’ve already told my husband i want to do the night feedings since i will be breast feeding (i know he can bottle feed at night but i just really want to breastfeed every chance i can) so basically i will be up nonstop basically. If i go back to work i just feel like i will be so tired & I don’t want to overwork myself especially since i don’t know how the postpartum stage will go for me and like i said i’m going to be a first time mom i feel as though that’s exhausting already. My mom

told me it will likely be very stressful on me and she wants me to be the best mom i can to my baby before trying to be the best nanny for someone else’s baby. I just feel very guilty bc i was suppose to be with this family for 3 years and i will only be with them for 1 and also the baby i nanny doesn’t do well with anyone other than her mom and I.

What would you do and if you would rather stay at home how would you let the family know? I love them and don’t want any harsh feelings to come from this.