3The sperm approaching the egg Sperm & egg join in the fallopian tube46 chromosomes combine, which pre-determine all of a person’s physical characteristics
4Fertilized Ovum 30 hours after conception No larger than a pin head Rapidly dividingThe fertilized Ovum is called a ZygoteFloats down from the fallopian tube towards the uterus
53 WeeksOnce in the Uterus, the developing embryo, called a Blastocyst, searches for a nice place to implantIt actually burrows beneath the surface of the uterusThe yolk sac produces blood cells during the early weeks of lifeIt is only one sixth of an inch longThe backbone, spinal column, and nervous system are forming.The kidneys, liver and intestines are taking shape
64 WeeksThe embryo produces hormones which stop the mother’s menstrual cycle
75 Weeks Embryo is size of a raisin Day 21 – the heart has begun beatingNeural tube enlarges into 3 parts, soon to become a very complex brainThe placenta begins functioningThe spine and spinal cord grows faster than the rest of the body and gives the appearance of a tail.
86 & 7 Weeks7 weeks – facial features are visible, including a mouth & tongueThe eyes have a retina & lensThe major muscle system is developedThe embryo practices moving and has its own blood typeThe blood cells are produced by the liver now instead of the yolk sac
98 Weeks Embryo now called a foetus Is about half an inch long Is protected by the amnionic sac, filled with fluidThe foetus swims and moves gracefullyArms & legs have lengthenedFingers can be seenToes will develop in the next few daysBrain waves can be measured
1010 WeeksHeart is almost completely developed and very much resembles that of a newborn babyThe blood is diverted away from the lungs by an opening of the atrium of the heart and the presence of a bypass valveThe blood is oxygenated through the placenta20 tiny baby teeth are forming in the gums
1112 Weeks Vocal chords are complete Can and does sometimes cry (silently)Brain is fully formedCan feel painMay suck his/her thumbEyelids now cover the eyes, and remain shut until the 7th month to protect the delicate optical nerve fibres
1214 Weeks Muscles lengthen and become organised Mother will soon start feeling first flutters of the feotus kicking and moving
1315 & 16 Weeks15 weeks – The feotus has an adults taste buds and may be able to savour the mother’s meals16 weeks – 5 and a half inches tall6 ounces in weightEyebrows, eyelashes and fine hair appearThe foetus can grasp with his/her hands, kick, or even somersault
1420 Weeks 20 weeks – can hear & recognise mother’s voice Still small & fragile but growing rapidlyCould possibly survive if bornFinger nails and finger prints appearSex organs are visibleWhat happens during an ultra sound?Ultrasound device can tell if girl or boy and pick up certain abnormalities such as Spina Bifida, Cleft Lip/Palate etc.
1524 Weeks Covered with a fine downy hair called Lanugo Tender skin is protected by a waxy substance called vernixAt birth- substance may still be on the skin but it will be quickly absorbedBreathing is practiced by inhaling amnionic fluid into developing lungs
1630 Weeks The umbilical cord has been the lifeline to the mother Nourishment is transferred from the mother’s blood, through the placenta, and into the umbilical cord to the feotusIf mother ingests toxic substances i.e. alcohol/drugs, the baby receives these as well
1732 & 36 Weeks 32 weeks – The foetus sleeps 90-95% of the day Sometimes experiences REM sleep, an indication of dreamingSummary - Ultrasounds week by week
1840 Weeks Now approx 7 & a half pounds Is ready for life outside its wombVaginal Delivery:CaesareanReal Life C-SectionAt birth the placenta will detach from the side of the uterus.Umbilical cord will cease working as the first breaths are taken.Child’s breathing will trigger changes in the structure of the heart and bypass arteries which will force all blood to now travel through the lungs.