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Diabetes is a disorder caused by the body's inability to use sugar properly and use and produce insulin properly.
Gestational diabetes can occur during pregnancy and appears in about 18% of women who did not have diabetes before pregnancy. Usually after the pregnancy ends gestational diabetes will disappear but women who experience it have a 30-60% chance of contracting diabetes later in life and the chance of it developing in their children increase as well. A balanced diet, physical activity, and medication can keep both types of diabetes under control.
Expectant mothers who are:
25 and older, overweight, or who have polycystic ovarian syndrome (PCOS) are more likely to develop gestational diabetes.
Delivery complications may include: Excessive birth weight, early birth and respiratory distress syndrome, low blood sugar (hypoglycemia), and type 2 diabetes later in life.
https://www.babycenter.com/0_gestational-diabetes_2058.bc
https://www.mayoclinic.org/diseases-conditions/gestational-diabetes/symptoms-causes/syc-20355339

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Pregnancy-induced hypertension or PIH is characterized by high blood pressure caused by pregnancy. It is also referred to as preeclampsia or toxemia.
Symptoms include: sudden increase in blood pressure. protein in the urine, and swelling.
PIH occurs late in pregnancy but the cause is unknown.
if left untreated, PIH can lead to damage or death to the mother or baby or both.
Early treatment may include: bed rest, medication, and an early delivery of the baby. This can help both the mother and the baby avoid serious health problems.
There are three types of PIH: Chronic hypertension, gestational hypertension, and preeclampsia.
Symptoms can include: severe headaches, vomiting blood, excessive swelling in the hands and feet, small amounts of urine or no urine, etc.
http://americanpregnancy.org/pregnancy-complications/pregnancy-induced-hypertension/
https://familydoctor.org/condition/pregnancy-induced-hypertension/

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Rh factor is a protein substance found on the surface of red blood cells of about 85% of the population, mainly Caucasians.
The only time the Rh factor can affect the baby is when the father is Rh+ and the mother is Rh-. If the baby inherits the Rh+ then they may develop Rh disease which is a type of blood condition that destroys the baby's red blood cells. Although, Rh disease does not affect the first Rh+ unborn baby because some of those Rh+ cells may enter the bloodstream during birth and the mother's Rh- cells will fight off the Rh+ cells which will make antibodies which then makes the mother immune to the blood cells of future Rh+ babies. In the next pregnancy, the antibodies will cross the placenta and if they baby has Rh+ blood, the antibodies will destroy the baby's blood cells. Fortunately, there is a vaccine called anti-Rh-immune globulin which greatly reduces the danger of Rh disease and is 99% effective.
Even though the fetus and the mother do not share blood systems, a small amount of blood from the fetus can cross the placenta into the mother's system via: amniocentesis, chorionic villus sampling (CVS) or from manual rotation of a baby in a breech presentation before labor.
If the mother's blood has the Rh antigen then she is Rh-positive, if it lacks the antigen it is Rh-negative.
https://www.acog.org/Patients/FAQs/The-Rh-Factor-How-It-Can-Affect-Your-Pregnancy
http://americanpregnancy.org/pregnancy-complications/rh-factor/

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Cytomegalovirus or CMV is a common virus that can cross the placenta during  prenatal development and infect the unborn baby which can be fatal for the embryo or young fetus.
In older fetuses, CMV can cause: brain, liver, and blood problems. But antiviral drugs may help reduce the severity of problems in newborns with CMV.
CMV is primarily contacted through contact with bodily fluids of young children but can be passed through sexual contact with an infected partner.
Once CMV is contracted it remains in the body for life and people in close contact with young children are at greater risk for CMV exposure
There are two types of CMV: Primary and recurrent. Primary is more dangerous than recurrent.
CMV is part of the herpes virus family.
http://americanpregnancy.org/pregnancy-complications/cytomegalovirus-infection/
https://www.babycenter.com/0_cytomegalovirus-during-pregnancy_1418404.bc

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Sexually transmitted infections (STIs) are infectious illnesses contracted mainly through sexual intercourse.
STIs can serious effects on an unborn baby.
A mother could also be infected with an STI and not even realize it because she may not show signs of the infection which could be extremely dangerous for the unborn baby.
STIs can enter the bloodstream of the mother and cross the placenta to the fetus or through the mother's reproductive tract and can pass to the baby during delivery. They can also be passed during breastfeeding.
Some STIs can be treated with antiviral medications while others can not like genital herpes, HIV, and Hepatitis B.
STIs raise the risk of: miscarriage, preterm birth, uterine infection, and stillbirth.
https://www.cdc.gov/std/pregnancy/stdfact-pregnancy.htm
https://www.babycenter.com/0_sexually-transmitted-infections-during-pregnancy_1427372.bc

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Rubella is a virus that can cross the placenta and affect the baby during the first three months of pregnancy.
While the disease is mild for the mother, the baby may be born blind, deaf, with an intellectual disability, or with heart problems.
The mother should receive the MMR (measles-mumps-rubella) vaccination for rubella during childhood but should avoid it during pregnancy because the vaccine itself is a risk to the fetus.
Less common effects from rubella are: Glaucoma, brain damage, thyroid and other hormone problems, and inflammation of the lungs.
Symptoms are: low grade fever, malaise, headache, swollen lymph nodes, joint pain and swelling, and reddened eyes.
https://www.cdc.gov/rubella/pregnancy.html
https://www.babycenter.com/0_rubella-german-measles-during-pregnancy_9527.bc

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During pregnancy, x-rays should be avoided if possible because x-rays aimed toward the fetus increase the likelihood of childhood cancer.
X-rays during pregnancy have also been linked to congenital disabilities in the fetus.
Although if an x-ray is necessary before delivery, it must be low in intensity, taken away from the fetus, and done only when the abdomen is shielded by a lead safety drape.
Fetal sensitivity to radiation exposure depends largely on the radiation dose to the fetus.
An embryo is most susceptible to the effects of radiation 2-7 weeks and 8-15 weeks after conception.
https://emergency.cdc.gov/radiation/prenatalphysician.asp
http://www.aafp.org/afp/2010/0901/p488.html