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Pregnancy week 4

In pregnancy week 4 your growing baby is very small - only about 0.04" long - or about 10 times the size of a human hair - you are not showing, have not gained weight (from pregnancy at least) and might not even realize that you are pregnant - its likely that you are expecting your period.

There is a lot going on in your body at this stage of pregnancy - the amniotic cavity that holds the amniotic fluid starts to form - the placenta is forming - the blood networks to support baby growth are forming - many layers of cells are developing - these layers called germ layers will develop into different parts of baby's body - there are 3 germ layers - the ectoderm, the endoderm and the mesoderm - the ectoderm will become the nervous system, brain hair and skin - the endoderm becomes the lining of baby's gastrointestinal tract, pancreas, liver and thyroid - The mesoderm develops into the skeleton, tissues, urogential system, muscles and blood system.
Pregnancy week guide 
   
                        Pregnancy week by week

						first trimester pregnancy

                        preconception

                        pregnancy week 1

                        pregnancy week 2

                        pregnancy week 3

                        pregnancy week 4

                        pregnancy week 5

                        pregnancy week 6

                        pregnancy week 7

                        pregnancy week 8

                        pregnancy week 9

                        pregnancy week 10

                        pregnancy week 11

                        pregnancy week 12

                        pregnancy week 13

                        pregnancy week 14

                        pregnancy week 15

                        pregnancy week 16

                        pregnancy week 17

                        pregnancy week 18

                        pregnancy week 19

                        pregnancy week 20

                        pregnancy week 21

                        pregnancy week 22

                        pregnancy week 23

                        pregnancy week 24

                        pregnancy week 25

                        pregnancy week 26

                        pregnancy week 27

                        pregnancy week 28

                        pregnancy week 29

                        pregnancy week 30

                        pregnancy week 31

                        pregnancy week 32

                        pregnancy week 33

                        pregnancy week 34

                        pregnancy week 35

                        pregnancy week 36

                        pregnancy week 37

                        pregnancy week 38

                        pregnancy week 39

                        pregnancy week 40