Only for our Segment Numerology, we have derived a 'system' of calculating Birth Day as Birth Segment.

Our 'system' of calculating Birth Segment is BN & TN, where as,
BN = Birth Number = single digit of Birth Date = d+d, 
TN = Total Number = single digit of Birth Date + Month + Year = d+d+m+m+y+y+y+y.

Only because of this system, we could able to prove 'some of our theories' like,

Child Birth as per Parent's Birth Segment,
Resemblance of the Child as per parent's Birth Segment,
Birth Segment with blood related relatives, 
Analysing Family Relationships, 
Male/Female cross behaviours, 
Falling into sudden love and attraction,
Getting married,
Health Risks and Heredity Diseases and 
Finally 'facing the DEATH'.

Our Human Genome, Genealogy and other theories will be released soon, by combining Birth Segment and Name Segments.

So, to easily understand our concept, one's Birth Day should be calculated as Birth segment!