Helen Spence (Mitchell) - Date of Death

I got an inconsistency flag on her son David's profile. David's dates are pretty well documented; whereas, the date her for Helen's death is circa 1633, nothing specific. I did some searching and most tress I'm seeing on Ancestry have her date of death as:

DEATH: 05 April 1639 NEW Dysart, Fife county, Scotland

This death date indicates she died giving birth to David since that's his date of birth. In fact, I read this in her About section, which confirms she died in childbirth on that date:

http://www.rootsweb.com/~mdsomers/history/dspence.htm

"....David and James, twins born 5 April 1639 and christened in Dysart 16 April 1639. Helen died in childbirth, as possibly did James..."

I was going to change it on her profile, but those fields are locked.