Congratulations on the new tiny tot!
Secondly.. are ya kidding me? Circumcision is NOT a big deal unless it's a religious issue. Snipping of the babyhood is well... a decision that is to be made between you and your husband. It's great your mom wants to be involved and offer advice, but she needs to learn that offered advice isn't always taken advice.
I'd suggest apologizing for blowing up without going over the same stuff again. You have no reason to explain your decision and trying to explain again just opens the door for even more discussion about it. Again, just apologize for blowing up. If she insists on bringing up the issue again, then gently but firmly assure her that you and your husband has weighed and considered all options and that you are very happy with your choice. Leave it at that.
My guess is.......... this really isn't so much about the circumcision. My bet would be on the fact there is an unspoken underlying issue your money has with DH's family since she has spoken to you about them "brain washing" you. If she has a problem, then she'll either come out with it or stew over it. Now is not the time to deal with other people's problems.... but instead enjoy the new baby and this very special time. You'll be shocked how you blink and this time will be over so quick. Take care...
Must use Buy It Now and PayPal.
)
)
)
Have there been any issues in the past where she's felt like you've had to "pick a side" between her and your dh? Sounds like it's more one of those issues than the circumcision in general. 
)
)
