Noonan's syndrome is a sex chromosome aberration. It is similar
to Turner's syndrome (complete or partial absence of one x
chromosome in the female), except that the chromosomes are
46xx in Noonan's. The problems arise due to a recessive mutant on
the x chromosome. Women (or men) with Noonan's tend to have
some of the features of Turner's syndrome, but generally have
normal stature, normal sexual development and fertility, and a high
incidence of heart malformations or chest wall malformations.
Mental retardation occurs frequently.
In Turmer's syndrome there is often failure of normal breast
development and genital development.
As sexual development and fertility are usually normal in Noonan's
syndrome, I would expect that it would not affect lactation. Are the
mother's breasts normal in size and shape??
- I am no expert here, getting my information from one of my trusty
medical textbooks.

Hope this helps

Fiona


Fiona Coombes MBBS IBCLC               [log in to unmask]
Lactation Consultant, Family Physician
Perth Western Australia