PED 392 Child Growth and Development

Timeline Usually a 40 week system Can also be a 38 week system with week 1 being the 3 rd week of the 40 week system Broken into 3 trimesters Week 15 Week Week 40

Week 1 Mothers last menstruation In a 38 week system, this is week -2.

Week 3 The baby is created!!! Fertilization of the egg Implantation In a 38 week system, this is week 1.

Week 4 Mothers missed period Cell differentiation begins

Week 5 Length = 0.1 in Brain, spinal cord, heart begin to develop Gastrointestinal tract begins to develop

Week 6 Length = in Tissue for vertebrae forms Heart beat is regular and blood flows Brain develops into 5 areas Arms and legs begin to develop

Week 8 Length = 0.5 in Lungs begin to develop Arms and legs continue to develop

Week 9 Length = 0.7 in All essential organs are formed or have begun to form

Week 10 Length = 1.2 in Pregnancy detectable by exam Head looks human Eyelids are developed Ear begins to form externally

Week 11 Length = 2.0 in Weight = 0.3 oz Eyelids closed (wont open again until week 30)

Week 12 Length = 2.4 in Weight = 0.5 oz Form recognizable as human Responds to stimulation Fingernails begin to develop

Week 14 Length = 3.4 in Weight = 1.6 oz Essential organs formed Circulatory system works Sex is distinguishable Fist can be made

Week 16 CONGRATULATIONS - its your 2 nd trimester Length = 4.7 in Weight = 3.9 oz Mother shows Skeleton can be seen in x-ray Toe-nails develop

Week 18 Length = 5.5 in Weight = 7.1 oz Baby can suck Sex organs distinct Meconium is made

Week 20 HALF WAY DONE!!! Length = 6.3 in Weight = 11.3 oz Vernix caseosa covers skin (white sticky substance) Quickening can be felt by mother

Week 22 Length = 7.5 in Weight = 1 lb Head and body has hair Babies movement increases

Week 24 HUGE WEEK!!!! Length = 8.3 in Weight = 1.4 lbs survive outside womb POSSIBLE with help Would need medical help for extended period

Week 26 Length = 9.1 in Weight = 1.8 lbs Eyes developed Startle reflex Foot and finger prints develop Air sacs form in lungs

Week 28 ENORMOUS WEEK!!!! Length = 9.8 in Weight = 2.2 lbs Survival outside womb PROBABLE with medical help

Week 30 BEGIN 3 rd TRIMESTER Length = 10.6 in Weight = 2.9 lbs Eyes open again Storage of minerals begins Iron, Calcium, Phosphorous

Week 32 Length = 11.0 in Weight = 3.7 lbs Fat forming on baby (until birth)

Week 34 Length = 11.8 in Weight = 4.6 lbs Fingernails grow to end of finger Skin smooth

Week 35 MONSTEROUS WEEK!!!!! SURVIVAL OUTSIDE WOMB EXPECTED Without medical help

Week 38 Length = 13.4 in Weight = 6.4 lbs Body plump Body hair gone Firm grasp

Week 40 Length = 14.2 inches crown to rump 20 inches head to toe Weight = 7.5 lbs BABY IS DUE!!!! Baby can come up to 2 weeks late Usually a c-section is scheduled after 2 weeks

Reference Tallack, P. (2006). In The Womb. National Geographic Society. Washington D.C.