Well, my immediate response is if you have a play area for them, an area where you can embrace, I see no real problem. Your older children may have an adjustment period to go thru, if they understand that you will be home in a short time and "that"
part of your life will be over,forever, I think they will accept the situation. As for your 3 year old, I am sure there will be some emotional issues, at 3 there will be no real understanding of what is going on, and no, your baby won't forget you.
Have you discussed the entire matter with your older children? If not, it might be a good idea, see what they have to say.
Don't know if I am on the right tract, but, this is what I feel.