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The mere existence of that cell should be one of the greatest accomplishments of the earth. The first sign of brain development appears at 18 days. Human development progresses rapidly in a highly organized fashion. With repeated cell divisions and various specialized cell types forming along the way, the tiny baby grows and repeatedly changes shape.
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The speed and complexity with which human development unfolds may surprise you. This process begins on day 6 with attachment to the uterine wall and ends roughly 12 days following fertilization.
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Implantation is the process whereby the embryo leaves the cavity of the uterus by embedding itself into the wall of the uterus. This relatively large blastocyst was previously inside the adjacent protective shell.
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Each step of the creative process represents a series of exquisitely intricate events, each timed to the other in hairline sequence. Think of the uncountable number of tissues and organs that sprang from this initial fleck of clay: the hair, the nails, the skin, the brain, the eyes, the ductless glands. 15Ĭomprehend if you can, how the most minute fragment of life-a single cell, just on the fringe of the microscopic world-can divide and redivide to make the billions and billions of cells in the body of a baby. In addition to the ability to work closely with mom, the simple-appearing, single-cell human embryo directs its own development throughout life using the instruction set present in its own DNA. Once fertilization is underway, the fragile early embryo is susceptible to damage from the surrounding environment, which includes exposure to toxins present in mom’s uterine tube or intra-uterine environment. The distinction about when human life and human development begin is more than an academic or theoretical question. Proponents of this once-popular theory believed that living things could form from dead matter. Principal Investigator, The Virtual Human Embryo ProjectĪs a scientific question, to argue that the human embryo or fetus comes alive at some point beyond fertilization is to support a modern version of the theory of spontaneous generation. …good paths of growth and development are the greatest gift society can give to the next generation.
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Research over the past 30 years has uncovered many ways in which a baby’s prenatal environment and growth pattern influence life-long health. 1 Prenatal growth and development influence lifelong health This hormone starts preparing her body to meet her baby’s needs. The first pregnancy hormone, called early pregnancy factor, appears in mom's blood as early as 24 hours after fertilization. The exceptional teamwork between mother and child begins almost immediately. Likewise, what is harmful to mom is harmful to her baby, and what is harmful to her baby is harmful to mom. With few exceptions, what is good for mom is good for her baby, and what is good for her baby is good for mom. Pregnancy is the ultimate expression of selfless teamwork as mother and child do everything, share everything, and experience everything together as they jointly pursue a healthy full-term pregnancy and safe delivery.Īs you might expect, a mom’s health and well-being are closely intertwined with the health and well-being of her child. A bond like no otherįrom the time of fertilization (or conception), the developing baby and mother seamlessly work together and communicate with one another in numerous and complex ways that are still not fully understood. With rare exception, virtually everything that a newborn baby can do has been practiced over and over again for weeks or months before birth. The nine months of pregnancy truly is a time of preparation for life after birth. To calculate the equivalent prenatal age referenced from a woman's LMP, add two weeks to the fertilization ages provided here. SOURCE: The Biology of Prenatal Development DVD (BPD video)Īll prenatal ages on this page are referenced from the start of fertilization, not the beginning of a woman's last menstrual period (LMP). The straight white line along the midline of the abdomen was formed when the two sides of his trunk fused together. You can also see his left nipple (0:05–0:07), the base of his umbilical cord (0:09–0:11), and both of his hands. This active baby has recently grown just enough to touch his hands together for the first time.