Define the Prenatal period
The period of gestation that is prior to birth
Define the Perinatal period
22 Weeks gestation to 28 day after birth
Define Postnatal period and the six categories within this
Anytime after birth
neonatal, infancy, childhood, puberty, adolescence, and adulthood
Define Neonatal
up to one month after birth
Define Infancy
First postnatal year
Define childhood
12 months - 12/13 years
Define adolescence
3-4 years post puberty
What is the estimated length of a pregnancy
281 days +/-13 days, or 40 weeks
What happens in each week? Week 1: week 2: Week 3: Weeks 3-8: Week 9 - term:
Week 1: preimplantation stage: zygote, morula, blastocyst
Week 2: Inner Cell mass forms bilaminar embryo
Week 3: Bilaminar embryo becomes trilaminar embryo
Week 3-8 : Embryonic period - organogenesis
Week 9 to term: Fetal period
Define gestational age
Gestational age is is the age of the conseptus from the presumed first day of the last menstrual period
Define Fertilization age
the age of the conceptus from the fertilization day
How much longer is the GA than the FA?
2 weeks longer
What is Naegele’s rule?
It is a rule to determine the due date. It is calculated: Last menstrual period prior to ovulation - 3 months +1 year + 1 week
What percent of women deliver on their due date?
5%
What percent of women deliver within 13 days from their due date?
60-70%
Define abortion
expulsion from the uterus prior to age of viability which is 22-23 weeks gestation, or
Define Miscarriage
spontaenous expulsionfrom the uterus before mid pregancy (22 weeks)
Define a Premature Birth
infants born btw. the stage of viability and 37 weeks
What is the all or nothing period
this is the first 2 weeks
What is the critical period?
This is the embryonic phase which is 3-8 weeks. The embryo is most vulnerable to teratogens during this period.