Several congenital heart defects might first show up at 3-4 weeks of age,
even in full-term, healthy-at-birth babies. The types that *don't* cause
cyanosis (blueness) are the ones that cause FTT, and most of those
wouldn't have had a murmur at birth.
Becky Saenz, MD
Assistant Professor
University of MS Medical Center
Department of Family Medicine
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