Simply replace the unfilled areas such as "" and "[date]" with your information.
Dear [New Mom],
Congratulations on the new baby [boy/girl]! You are so blessed. [Baby Name] will bring you so much love, joy, and happiness. I can't begin to tell you how happy I am for you and your family.
I know that when a new mom and baby first come home, there are so many things to do. Although it is wonderful, it can also be overwhelming at times. Sometimes, moms can be so dedicated that they forget to make time for themselves. It is a very wise and strong mother who will accept help from others.
Please do not hesitate to ask me for help. I can help you by [specific task] or I can [another specific task]. I am great at doing [additional specific task]. Also, I can [final specific task]. I would be pleased to do any of these things. It would make me so glad to know that I could be there for you in this way.
I will call you soon to see what I can do to help you. Just remember, letting me support you will make me happy and give you much more time to love your new baby.