The invalidity of the Hajj performed by a woman who had her hair cut at birth is a groundless superstition
A:
It is an act of Sunnah ((whatever is reported from the Prophet))
to cut the hair of the newborn on the seventh day of his or her birth. It is also an act of Sunnah to make `Aqiqah (sacrifice for a newborn) and give Sadaqah (voluntary charity) equal to its hair's weight in gold. It is not a requirement to shave all the hair of the baby.
As for the invalidity of the Hajj performed by a woman who had her hair cut at birth, it is a groundless superstition. (Part No. 10; Page No. 16) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.