Having got that information about the parents and desired year of birth, the app will provide 5 variants of timeframes for conception and probability of the gender for that period.
Sample of app’s output:
95% – boy – from March 27th, 2009 till May 16th, 2009
80% – girl – from August, 2009 till October, 2009
65% – boy – from December 2nd, 2009 till January 19th, 2010
The app is free, every prediction costs only $0.99.
If you have some doubts, you can ask program to predict sex of already born person for free (by entering same information on the person’s parents and the person’s birthday).
Developer Website: http://childrenboom.com/en/