The document summarizes the human reproductive process from fertilization through birth. It describes how fertilization occurs when sperm enters an egg in the uterus. Pregnancy lasts approximately 9 months as the fetus develops in the womb. Labor is triggered by uterine contractions and involves three stages - dilation of the cervix and vagina, birth of the baby, and delivery of the placenta. Newborn babies are typically 50cm long and weigh 3kg at birth. They receive nourishment from breastmilk or formula if the mother cannot lactate.

1. Kayla, Carlota, Andrea, María e Itziar The reproductive process

2. Pregnancy and labour

3. Fertilization and pregnancy The sexual organs: To be pregnant you need a male sexual organ ( the penis ) and a female sexual organ ( the vagina ). The penis will be introduced into the vagina and will leave the sperm there. Fertilization: When a spermatozoid enters into the ovule( ovum, egg ) the fertilization is finished . A zygote is formed and fixed to the uterus where it grows. P regnancy: It is the period of time from the fertilization to the birth. The pregnancy last s 9 months approximately. The f o etus: Usually humans have 1 or 2 children, but sometimes we have up to 5 children ( quintuplets ). The baby still in it’s mother’s womb is called:Foetus. It eats trought the unmilical cord. Developmen t of the foetus: At 20 days, the nervous system will be established, and at 42 days the skeleton will be alredy form ed . Between the 9 and 10 weeks, he/she will suck shumb. At 12 weeks, it’s body will be fully formed. At 16 weeks, the fetus opens and closes the hands and swim s . At 9 months approximately, the foetus will be born.

4. Labour and b irth Labour: It is considered that a women starts the labour with the regular uterine cotractions which are increasing in itensity and frequency, accompaied by phisiological changes in the cervix. T he process of giving birth is called labour. Birth: The involuntary muscles produce contractions in the uterus. The sac containing the foetus brakes and the liquid is expelled outside the mother´s body . There are three stages of labour: ·Dilation: The vagina dilates so that the baby have enough space to come out. ·Birth: when the baby leaves the mother’s womb. ·Afterbirth: the placenta is expelled.

5. Newborn babies and lactation Newborn babies: th e umbilicard cord is cut (t he mark left is the belly button ) when a baby is born . He/she is about fifty centimetres long and weigh about three kilograms. Babies born berfore term are called premature. They are kept in incubators, where they can develop and grow stronger. Lactation: It is the period when babies get their nourishment from their mother’s milk.If a mother cannot, produce milk, infant formula is used. The energy needs of the newborn are 60 kilocalories per kg per day, to mantain your weigh, and 100 to 200 for a weight gain.