During the fifth week of fetal development, a baby begins to develop its heart, muscles, bones, spinal cord and brain, according to WebMD. During this time, the umbilical cord connects to the baby to supply blood, oxygen and nutrition. The placenta and amniotic fluid begin to form in the womb.Know More
Parents magazine explains the heart starts to divide into four chambers, and tiny cardiac muscle cells begin to contract. The yolk sac disappears as the umbilical cord attaches to the uterus. At five weeks, the embryo is the size of an apple seed, and it looks like a tadpole with a tail. Pregnancy symptoms such as morning sickness, tender breasts, fatigue and more frequent urination may appear at this stage.
Baby Center states that three distinct layers begin to separate into various organs. The top layer, or ectoderm, contains the neural tube that forms the spinal cord, brain, backbone and nerves. The middle layer, or mesoderm, contains the heart that beings to pump blood at five weeks. The endoderm, or innermost layer of tissue, forms other internal organs later in the pregnancy.
During the sixth week of fetal development, limbs start to form, and the eyes begin to distinguish themselves on the surface. When a doctor does an ultrasound, a heartbeat may be heard at this time, according to WebMD.Learn more about Pregnancy
The most likely time a woman with a regular 28-day menstrual cycle can conceive will be at approximately the 14-day or mid-cycle mark, according to WebMD. Abnormal menstrual cycles may happen for a variety of reasons, and repeated irregularities should be mentioned to a physician. according to the Mayo Clinic.Full Answer >
A woman who is experiencing her second or third pregnancy can feel the baby move at 13 weeks, according to WebMD. Women pregnant for the first time do not generally feel the baby's movements until at least 16 weeks. It is not uncommon for first-time mothers to not feel movement until they are 25 weeks pregnant.Full Answer >
A woman with an average 28 day menstrual cycle is most likely to get pregnant between days 12 and 15 of her menstrual cycle according to WebMD. The exact number of days that ovulation occurs after a woman's period ends varies based on the woman's menstrual cycle. If a woman's period lasts 5 days, this would be 7 to 10 days after her period has ended.Full Answer >
At 10 weeks, a pregnant woman's uterus is roughly the size of a grapefruit. Externally, the abdomen is unlikely to show visible signs of pregnancy, but clothes may feel tighter and less comfortable in the waist.Full Answer >