These are the most frequently used words in this book.
air
although
amniotic
appear
arms
baby
becoming
beginning
behaviour
birth
blood
body
bones
born
boy
brain
breathing
cells
cm
continue
cord
crown
days
develop
developed
developing
development
down
during
early
ears
embryo
even
eyelids
eyes
face
fat
fetus
few
fingers
first
fluid
form
formed
fully
gestation
girl
grams
growing
growth
hair
hands
head
heart
help
however
intestines
kilograms
last
legs
length
little
lungs
mature
may
mm
mother
mouth
move
movements
nerve
now
open
organs
period
picture
placenta
pregnancy
quite
reflex
rest
rump
sac
second
see
skin
sleep
still
system
third
though
thumb
time
trimester
twins
two
umbilical
uterus
weeks
weight