At 4 weeks the embryo's outer cells are tunneling into the lining of the mother’s uterus so blood flow from mom will be able to provide nutrients and oxygen to the growing baby. There's now a sac containing amniotic fluid to cushion the baby as he/she grows. The tiny embryo also has a yolk sac which temporarily provides nourishment and makes cells that turn into the umbilical cord, gastrointestinal system, and reproductive organs. Keep praying for your baby!

• Heart begins to beat
• Arm buds appear
• Liver,pancreas, and gall bladder start to form
• Spleen appears

For more information go to Annunciation Respect Life Ministry

Image : https://flexbooks.ck12.org/cbook/ck-12-middle-school-life-science-2.0/section/11.72/primary/lesson/pregnancy-and-childbirth-ms-ls/

Your spiritually adopted baby’s development at approximately 8 weeks:  

Your baby is moving! The movements start at about 7 to 8 weeks and are visible on ultrasound. You won't feel your baby move until sometime between 16 and 22 weeks, though. Your baby's respiratory system is forming. Breathing tubes extend from your baby's throat to the branches of their developing lungs. A network of nerves is spreading through your baby's body, making connections not only with each other but also with muscles and other tissues, as well as organs like the eyes and ears!


  image: https://www.babycenter.com/pregnancy/week-by-week/8-weeks-pregnant
 

                                         

Your baby's eyes can now open and close! Your baby may move in response to light: If you shine a flashlight at your tummy, you might feel a burst of flutters and wiggles! You may be experiencing your baby’s hiccups about now too. Any tiny, rhythmic movements you feel are likely fetal hiccups. Each episode usually lasts only a few moments, and they're totally normal, so relax and enjoy the strange sensation. Your baby is also getting ready to breathe. Your baby's lungs are making surfactant. This liquid substance helps the alveoli (tiny air sacs in the lungs) remain open, which makes it possible for your baby to breathe after birth.

image: https://www.babycenter.com/pregnancy/week-by-week/27-weeks-pregnant

The bones in your baby's skull aren't fused together, which allows them to move and slightly overlap. This makes it easier for your baby to fit through the birth canal.   The skull bones don't entirely fuse until early adulthood, so they can grow as your baby's brain and other tissue expands during infancy and childhood.

Your little one is rapidly losing that wrinkled look. Their baby skin is less red and transparent – it's becoming soft and smooth as your little one plumps up in preparation for birth.

It's getting snug in your womb, so your baby isn't doing as many somersaults, but the amount of movement you feel should remain about the same. After your baby moves to a head-down position in preparation for birth, you may feel kicks in new places, like underneath your ribs on one side or the other.

Information and Image: https://www.babycenter.com/pregnancy/week-by-week/33-weeks-pregnant