My condolences to you on the loss of your daughter in 2012. I agree with you that once you have experienced the death of a child you do have extra concerns over the welfare of your other children. What is a rainbow baby? Is it "over the rainbow where dreams come true'? Much good luck to you with many blessings for a good and healthy life for your newborn. My wish is for you to be able to be in the pleasurable moments more with your newborn and that as those times increase your anxieties will decrease.
Peace & blessings,