what will be your reply?

My children have asked that question and I told them that they came from mommy and daddys love.

i would try and only give her the outline like moomy and daddy or when two people fall in love i wouldnt give details till they were old enough to understand all of it i havent had that question yet but i am sure i will

It depends on their age. If they are very young they'll get the simple "from my tummy" (or if it is one of my future children who will be adopted "from a woman's tummy") answer. If they are old enough to understand more I'll tell them more. I will always be honest with them. I think it is a mistake to tell kids things like "the stork" or "the cabbage patch". I plan on explaining things like adoption and surrogacy to my children when they are old enough to understand because I want those to be a normal part of life for them and not something strange and confusing.