At the earliest stage, the new person is referred to as a zygote and is no larger than a single grain of sand.
.. A function called implantation happens from five to nine days after fertilization.
.. Once he/she has implanted, your baby is called a blastocyst and is about 0.1 – 0.2 mm in diameter.
.. Between weeks three and four (18 to 25 days after fertilization) the developing baby’s heart begins to beat. Arm and leg buds form. The face – eyes, ears, nose and mouth – begin to take form.
.. Month Two .. Your baby now is only about one inch long and weighs no more than one whole peanut.
.. The lining of the placenta begins to develop but does not take over the production of hormones until about week 12. Brain waves are detected.
.. When you see your baby through ultrasound at week six, you’d be amazed by how much he or she has already developed.
.. the end of month two, your baby receives a new technical name to describe his/her development: fetus
.. All organs are present – and most are functioning – although some need more time to develop. The irises of the eyes develop, fingernails are visible and your baby can curl his/her fingers around an object. He or she also hiccups, has taste buds on the tongue and tooth buds in the gums.
.. Month Three
Your baby can smile, make funny faces. She/he can practice “breathing” the amniotic fluid in/out of the lungs, all 20 teeth are formed and waiting to develop. Your baby is now approximately one ounce in weight
.. At 15 weeks, loud sounds may actually cause baby to startle. Some moms and dads find that quiet music played near mom’s tummy will cause baby to relax and calm down.
.. Month Four
Your baby is now about eight inches tall from head to toe.