When writing a letter or card to a mother who has just adopted or given birth to a new baby, a simple statement of congratulations is often enough. Heartfelt sentiments that express how happy the writer is for the new mother should be expressed briefly and can include references to the baby's name or gender, shared memories with the mother or statements of excited anticipation regarding the baby's life.
If the new mother has just given birth to her first child, she may be a bit nervous, so statements about how lucky the baby is to have her as a mother, giving reasons why, are especially appropriate. Mothers who already have several children may appreciate expressions of what a good job she has been doing as a mom. Expressions of faith or shared jokes are very appropriate if these elements are already part of the relationship with the new mother. When congratulating an adoptive mother, it is important to avoid mentioning the birth process or any inherited traits. The new arrival should otherwise be treated like any other.
While experienced parents are often tempted to include good parenting advice in their congratulations letters, sometimes these messages are received by new moms as statements that they are not doing an adequate job. It is best to opt for simple congratulations and best wishes and avoid the advice. Offers to help out, however, are always acceptable in a card to a new mother.