maaaring gumamit ng calendar method.
egg cell has 2 x chromosomes.
sperm cell has either x or y chromosomes.
para magka girl dapat ay sperm cell with x chrom. ang sperm cell with x chrom ay mabagal at mas nakakasurvive ng matagal. dahil magttravel pa ang sperm cell with x chrom to meet the egg cell, unlike sa sperm cell with y chrom na hindi na makakasurvive.
kaya magkaroon ng contact after matapos ang period or 3-5ays before ovulation.
ang sperm cell with y chrom ay mabilis. kaya nabubuo ang boy during ovulation period dahil namemeet agad ang egg cell since mas mabilis kesa sa sperm cell with x chrom.
para mas madali, you may use calendar app na may expected gender. based from experience, in my 2 pregnancies, tama ang expected gender.
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