In the sixth month of pregnancy, the baby experiences significant growth and rapid development, especially in the brain, which is now advancing quickly. This month marks a period of fine-tuning many of the baby’s features and functions, preparing for the stages ahead. The baby’s skin appears wrinkled and red due to the lack of fat beneath, but a creamy protective layer called vernix is covering it. This vernix coating shields the delicate skin from the amniotic fluid and helps reduce the impact of friction.

Eyebrows and eyelashes are now fully formed, adding definition to the baby’s face. The bones continue to harden, making them more solid as they approach the strength needed for birth. Remarkably, the eyelids, which have been fused shut, now start to separate, allowing the baby’s eyes to begin opening gradually. At the same time, toenails are starting to grow, a sign of the intricate physical development occurring at this stage.

The baby is now able to hiccup, which is sometimes noticeable to the mother as rhythmic movements. This reflexive action helps prepare the diaphragm and respiratory muscles for life outside the womb. Additionally, brown fat begins to form in the baby’s body, providing a crucial source of insulation and warmth that will be essential after birth. While the baby is nearing full formation, the lungs are still maturing and are not yet ready to function independently.

By the end of the sixth month, the baby will measure about 11 to 14 inches in length and weigh between 1½ and 2 pounds. These developments reflect the baby’s steady journey toward viability, as each week brings new growth and readiness for the world beyond the womb.