The 5th month of pregnancy begins at the start of week 17 and lasts until the end of week 20.
Understanding the Pregnancy Timeline
Pregnancy is typically divided into three trimesters, each lasting roughly three months. The 5th month falls within the second trimester, a phase often regarded as the most comfortable period for many expectant mothers. But pinpointing exactly when the 5th month begins can be confusing due to how pregnancy weeks are counted.
Pregnancy is measured from the first day of your last menstrual period (LMP), not from conception. This means that by the time you miss your period and find out you’re pregnant, you’re already considered about four weeks pregnant. The counting continues week by week, and these weeks are grouped into months for easier understanding.
The 5th month starts at week 17 and continues through to week 20. This means that once you hit day one of week 17, you officially enter your fifth month. It’s a crucial time marked by significant fetal growth and noticeable changes in the mother’s body.
How Weeks Translate Into Months During Pregnancy
Pregnancy lasts about 40 weeks in total, which is roughly 9 months plus one week. Since months vary in length (28 to 31 days), pregnancy months are approximated by grouping weeks rather than calendar months.
Here’s a quick breakdown:
- 1st Month: Weeks 1-4
- 2nd Month: Weeks 5-8
- 3rd Month: Weeks 9-13
- 4th Month: Weeks 14-16
- 5th Month: Weeks 17-20
- 6th Month: Weeks 21-24
- 7th Month: Weeks 25-28
- 8th Month: Weeks 29-32
- 9th Month: Weeks 33-40
This system helps healthcare providers track fetal development milestones accurately and guides mothers on what to expect during each phase.
The Importance of Knowing When the Fifth Month Starts
Knowing exactly when your fifth month begins lets you anticipate key developmental stages for your baby and prepare for changes in your body. For example, many women notice increased energy levels during this time compared to the first trimester, along with visible baby bumps as the uterus expands.
Healthcare appointments often become more frequent around this time. Ultrasounds performed during weeks 18-20 provide detailed anatomical scans to check fetal health and detect any anomalies early on.
The Baby’s Development in the Fifth Month
The fifth month marks a vibrant period of growth for your little one. Around week 17, your baby is about five inches long and weighs roughly five ounces—about the size of a turnip. By week 20, they grow closer to six inches and weigh nearly ten ounces.
During this time:
- Skeletal development accelerates. Bones harden as cartilage turns into bone.
- The nervous system matures. Your baby starts making more coordinated movements.
- Senses begin functioning. Taste buds form, and hearing improves.
- The skin develops. Though still translucent, skin starts producing vernix caseosa—a protective waxy coating.
- The baby becomes active. Many mothers feel their first distinct kicks or flutters known as “quickening.”
This period is also when gender may be identified via ultrasound if parents wish to know.
The Mother’s Body During The Fifth Month
Physically, many women experience relief from early pregnancy symptoms like nausea or fatigue by this stage. However, new sensations emerge:
- Belly growth: The uterus expands beyond the pelvis, making clothes tighter around midsection.
- Sensation of movement: Feeling those first kicks can be thrilling and reassuring.
- Mild aches or back pain: As posture shifts to accommodate baby weight, some discomfort is common.
- Skin changes: Stretch marks may start appearing; pigmentation changes like linea nigra can become evident.
- Nasal congestion or bleeding gums: Increased blood flow affects mucous membranes.
While energy often improves during this stage, it’s essential to maintain balanced nutrition and stay hydrated to support both mother and baby’s needs.
Nutritional Needs During The Fifth Month of Pregnancy
The fifth month demands increased nutrients to fuel rapid fetal growth. Caloric needs rise modestly—about an additional 300 calories daily compared to pre-pregnancy intake—but quality counts more than quantity.
Key nutrients include:
- Protein: Supports tissue growth for both mom and fetus.
- Iron: Prevents anemia by helping produce extra blood cells.
- Calcium & Vitamin D: Essential for strong bones and teeth development.
- DHA (Omega-3 fatty acids): Crucial for brain and eye development.
- Folate/Folic Acid: Continues protecting against neural tube defects even after early pregnancy stages.
A well-rounded diet featuring lean meats, dairy products, leafy greens, nuts, seeds, whole grains, fruits, and fish low in mercury supports these needs effectively.
A Sample Nutritional Table for Fifth-Month Pregnant Women
| Nutrient | Recommended Daily Intake (RDI) | Main Food Sources |
|---|---|---|
| Protein | 71 grams/day | Poultry, beans, eggs, tofu, dairy products |
| Iron | 27 mg/day | Liver, spinach, lentils, fortified cereals |
| Calcium | 1000 mg/day | Dairy products, fortified plant milk, broccoli kale |
| DHA (Omega-3) | Around 200-300 mg/day* | Sardines, salmon (low mercury), flaxseeds supplements |
| Folate (Folic Acid) | 600 mcg/day | Leafy greens , fortified cereals , legumes |
Key Takeaways: When Does The 5th Month Of Pregnancy Start?
➤ The 5th month begins at week 17 of pregnancy.
➤ This marks the start of the second trimester’s midpoint.
➤ Fetal movements become more noticeable during this time.
➤ The baby continues rapid growth and development.
➤ Mothers may experience increased energy and appetite.
Frequently Asked Questions
When does the 5th month of pregnancy start?
The 5th month of pregnancy starts at the beginning of week 17 and continues through week 20. This marks the start of the second trimester, a period often considered more comfortable for many expectant mothers.
How is the 5th month of pregnancy calculated?
Pregnancy is measured from the first day of your last menstrual period (LMP), not conception. The 5th month is counted by grouping weeks, specifically weeks 17 to 20, rather than calendar months due to varying month lengths.
What changes occur when the 5th month of pregnancy starts?
When the 5th month begins, many women notice increased energy and visible baby bumps as the uterus expands. This period also involves important fetal growth and more frequent healthcare appointments.
Why is it important to know when the 5th month of pregnancy starts?
Knowing when the 5th month starts helps you anticipate key developmental milestones for your baby and prepare for bodily changes. It also signals an important time for detailed ultrasounds and health monitoring.
What fetal developments happen during the 5th month of pregnancy?
During the 5th month, your baby grows significantly, reaching about five inches long and weighing around five ounces at week 17. By week 20, growth continues with increased size and weight as major organs develop.
Common Medical Checks During The Fifth Month
Prenatal visits during this phase focus on monitoring both maternal health and fetal progress . One key procedure between weeks 18 -20 is the detailed anatomy ultrasound scan . This comprehensive imaging examines :
- Fetal organ development : brain , heart , kidneys , spine , limbs .
- Placenta position : ensuring it isn’t covering the cervix ( placenta previa ).
- Amniotic fluid levels : adequate cushioning for baby movements .
- Fetal growth measurements : confirming size matches gestational age .
Blood pressure , weight checks , urine tests , and listening to fetal heartbeat are standard parts of these appointments . Your provider may also screen for gestational diabetes around this time if not done earlier .