Fetal Development

Oxygen, Nitrogen, Carbon dioxide, Nutritions and alcohol can pass.

And only one type of antibodies can pass which is the IgG. Viruses can pass like HIV and HBV (Hepatitis B virus) that's why the affected mothers usually have affected babies.

When it dies.

The term womb drop actually is inaccurate. What actually happens is the baby drops further down in the womb. His head becomes engaged in the pelvis which means his head is pressing against the cervix, or the doctor/midwife will say the head is applied against the cervix.

In a first pregnancy this can happen a couple weeks before the baby is due. But it is exciting. it means everything is working and the time is getting close.

A woman who has already had a baby, sometimes doesn't "drop" until right around the time she goes into labor, or is in labor.

The above answer is actually incorrect, Yes you can tell the sex from 12 weeks onwards if the sonographer has researched and knows how to use the nub theory which is basically the angle of the dangle, every baby has a nub that does look like a willy up until around the 16th week but it is the angle of the nub which allows you to determine gender for boys the nub has to be pointing up on more than a 30 degree angle and girls lower, the girls nub tends to be flat and in line with the spine there is lots of information on the 'nub theory' which claims to be 95% accurate at 12/13 weeks and in my own personal experience having two little girls and seeing there nubs both me and sonographer agreed they were girls hope this helps :)

The placenta is the organ that feeds and shelters the fetus during pregnancy. It facilitates the exchange of nutrients, oxygen, and waste products between the mother and the developing fetus through the maternal blood supply. Additionally, the amniotic sac, filled with amniotic fluid, provides a protective cushioning environment for the fetus, allowing for movement and development.

Average what? Weight? Length? Amount they eat? Please be more specific in your question.

Sometimes the baby turns and causes you not to be able to hear the heartbeat.

I am also 31 weeks. Congratulations! Our lamaze coach says that we should feel baby move at least 8 times in an hour. I don't really feel that unless I am lying down! So most of the day, when I am moving around I don't feel him much at all. Some days I feel him more than other days. I try not to panic when I don't feel him for a while. I lie down on my left side and try to relax and within a few minutes - I feel him bumping around. Good Luck!

Baby's heart can be seen beating when you do the first ultrasound scan at one and half month of missed period. It probably start beating at the age of five weeks of your last menstrual period. Initially it is a small tube gradually getting converted into heart by three months.

In the embryo the neural tube forms the central nervous system in the fetus, which is the brain and spinal cord.

The reason pregnant women are given folic acid supplementation is to help prevent neural tube defects, which can range from fairly benign all the way to anencephaly (where the baby is born without a brain).

around 27 weeks

Through the placenta and umbilical cord.

the placenta

First as the mother you must be taking your prenatal vitamins and eating properly. Which means when your thirsty you should drink, hungry you should eat or snack. Eating is what keeps your baby growing and eating is very important. Keeping iron up and drinking lots of fluids. If you have been doing all of these things then it is meant for you to have a smaller then average baby, if not at this point you are going to have him/her soon so just take the best care of your child once they are here. You can only do so much as a person so just take care of yourself eat right and do what you can.

The endometrium begins to form shortly after the fertilized egg (blastocyst) implants into the uterine wall (endometrium). This typically occurs 3-4 days after fertilization. After implantation, the endometrium is called the Decidua, and basalis is the portion directly under the blastocyst. The Basalis joins the chorionic villi to make the placenta.

APEX~ a few days after fertilization

it isn't an exact answer it depends on the vagina.

it may be possible to tell the baby's gender at the 20 week ultrasound but then it just depends what position the baby is lying in.

This condition is called Placenta Previa. With placenta previa, the placenta grows on the lower part of the uterus partially or totally covering the opening of the cervix. The placenta should form at the top of the uterus, above the baby. With a normal pregnancy, the baby would be born first, then the placenta. With placenta previa, the placenta would be delivered first. Women with placenta previa require a c-section because as soon as the umbilical cord comes into contact with oxygen, the baby will automatically breathe with his lungs. Delivering the placenta first puts the baby at risk of suffocation in the womb.

The remnants of the fetal opening between the right and left atria is referred to as the foramen ovalis. This is the opening during the fetal life and referred to as remnants due to the opening closing soon after birth.

Well the heart develops and begins beating around week 5 and can usually be detected around week 6 1/2-7. If you doctor doesn't feel that this is an issue then it is probably fine. Sometimes gestational age is miscalculated or the fetus might just be a little behind. If you do not feel that your doctor was concerned when you were, then you might try finding a different doctor. When you call to make an appointment, be sure to explain to the receptionist that you are "X" weeks pregnant, had an ultrasound at 7 weeks and there was no heartbeat and you would like a second opinion to make sure things are still going smoothly.

yes you can have a miscarriage without the cervix dilating. its usually an early miscaragie <4 wks. I had a miscarragie at around 3 wks and my cervix never dilated per my gyno. my hcg blood levels where 290 so i was pregnanct and miscarried.

Low down, under you belly button! (It's awesome the first time!)

The normal fetal heart rate is 110-160. A constantly high baby heart rate is typically associated with an elevated temperature in with the Mom. That being said a baby's heart rate can and should go about this range periodically if it is healthy. If you have a temperature you should consult your physician immediately to rule out harm to the baby.

It functions the same before and after birth, to conduct urine from the bladder to outside the body for elimination. Urine is developed in fetuses when the baby swallows amniotic fluids and as fluids are provided via the blood from the mother.

The urine that is released in utero combines with the other wastes and fluids in the amniotic fluid and is critical for maintaining the necessary fluid levels in the amniotic sac so that the fetal lungs will properly develop. If there is an obstruction of the urethra that prevents the urine from flowing into the amniotic fluid, the fluid level in the sac can go too low and the lungs will not properly develop, and the kidneys and urinary system can be severely damaged by the obstruction.

They develop by feeding from the yolk of the egg that the frog has laid and that is the equivalent of a placenta.