What's math got to do with it with getting pregnant and pregnancy? This deals with all aspects of pregnancy. From counting minutes, hours, days, weeks, and years. Measuring the fetus and other parts of the pregnancy. To understand what's normal in terms of numbers and what's not.

Mathematics is the science that deals with numbers. It is all around us, in everything we do, and it plays a significant role in getting pregnant and pregnancy, making a baby to having one.

This page on babyMed is dedicated to the mathematics of pregnant, bringing together all number aspects related to pregnancy.

How are these numbers related to pregnancy?

Number |
What it means |

1 | The number of fetuses in a singleton pregnancy |

2 | The number of fetuses in a twin pregnancy The number of vessels in a two-vessel cord |

3 | The number of fetuses in a triplet pregnancy The number of vessels in the normal umbilical cord |

4-5 | The average number of days of a menstrual period |

5-6 | The number of fertile days in a menstrual cycle The number of days a sperm can survive inside the uterus |

9 | The average days between fertilization and implantation |

9.98 | The perinatal mortality rate per 1,000 live births in the first 28 days of life in 2013 in the United States |

12-24 | The hours the eggs survives after ovulation |

12-13 | In weeks when the 2nd trimester begins |

14 | The day when in a 28-day menstrual cycle ovulation happens |

20 | The weeks when an anatomy sonogram is usually done |

21 | The minimum number of a menstrual cycle |

24 | The weeks when a fetus becomes viable |

25 | The blood level mIU/ml of HCG human chorionic gonadotropin to determine that there is a pregnancy |

25-29.9 | The BMI or body mass index when someone is considered overweight |

26-27 | In weeks when the third trimester begins |

28 | The maternal mortality rate per 100,000 births in 2013 in the United States |

30 | The BMI or body mass index when obesity begins |

28 | The days of an average menstrual cycle |

35 | The maximum number of days in a menstrual cycle |

37 | The weeks an early term pregnancy begins (early term 37-39 weeks) |

39 | The weeks a term pregnancy begins (39-41 weeks) |

41 | The weeks a late-term pregnancy begins (41-42 weeks) |

42 | The weeks a post-term pregnancy begins |

266 | The number of days between fertilization and the due date |

280 | Or 40 weeks. The number of days from the 1st day of the menstrual period until the due date |

400 | The average number of eggs (out of 1-2 Million at birth) that will mature over a woman's fertile life (age 15-45 or so) |

500 | The weight of the fetus in grams beyond which it is generally considered viable |

4000 | The baby weight in grams (or 4,500) beyond which it's usually considered to be "macrosomic" (big). |

400,000 | The number of immature eggs a girl has at the time of menarche (when ovulation and the menstrual cycle begin) |

1-2 Million | The number of immature eggs a girl has at birth |

4 Million | About how many babies are born each year in the United States |

10 Million | The number of sperms in the ejaculate the make you less fertile |

100 Million | The average number of sperm in a normal ejaculate |