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At birth, the thymus and spleen are well developed lymphoid organs. The thymus is important for T cell maturation, while the spleen functions in filtering blood and producing immune responses. Both organs play key roles in the development of the immune system in newborns.
Before birth
During this time period, the embryo is known as a fetus. It continues to grow and develop, with its organs maturing and becoming more functional. By the time of birth, the fetus is fully developed and ready to survive outside the womb.
Babies with a low birth rate normally have problems with their internal organs not being fully developed. A child may have a low birth rate is due to a mother's nutrition, activity level and over all health that caused the child to have an early birth.
Baby organs are the internal organs that form and develop in an infant's body during pregnancy. These organs are essential for performing vital functions such as respiration, digestion, and circulation. The development and proper functioning of baby organs are crucial for the health and well-being of the infant both before and after birth.
Human organs generally finish developing within the first few years of life, but some continue to grow and mature into adolescence and early adulthood. The brain, for example, is not fully developed until the mid-20s. However, organs like the heart and lungs are typically fully functional by early childhood.
A fetus is generally considered fully developed at around 37 weeks of gestation, which marks the beginning of the third trimester. By this time, most major organs and systems are mature enough to function outside the womb, though full maturity can vary. Birth typically occurs between 37 and 42 weeks, with delivery before 37 weeks classified as preterm.
An Embryo is a stage before Fetus, the Fetus is more developed than an Embryo, the stage of Birth and a baby being more developed than a fetus.
After a sperm fertilizes an egg its referred to as a zygote. Then it becomes a fetus, I believe after the first trimester.
Babies are not born blind and deaf, but their vision and hearing are not fully developed at birth. Newborns can see light and shapes, and their hearing is sensitive to sounds. Over time, as they grow and their sensory organs mature, their vision and hearing will improve.
The organs are not fully developed yet, but close. The lungs are not completely developed and will not be fully developed until a couple years into birth after the alveolar period. "The saccular stage starts at the 24th week and lasts until the fetus comes to term. Airway development begins to spread out and form airspaces, or saccules, within the chambers. The airspace expands as saccules continue to form. The bronchiole formations that appeared in the previous stage begin to grown into alveoli and develop into a cluster of airways throughout each chamber." In the saccular phase the last generation of air spaces in the respiratory part of the bronchial tree is born.
A woman's eggs are developed before their birth. A woman is actually born with all of the eggs she will ever have.