Week 3 of Pregnancy:

In the 3rd week of pregnancy, the fetus develops from a morula into a fluid-filled cell cluster (blastocyst) with about 100 cells, beginning to implant in the uterus. The part that will form the placenta secretes human chorionic gonadotropin (hCG), making early pregnancy tests positive. Menstruation stops this week, and a pregnancy test can confirm conception. Even with poor appetite, forced eating is needed to ensure nutrients for fetal development.

How to Achieve Nutritional Balance for Expectant Mothers?

1. Eat small, frequent meals with light, digestible foods
   Overeating or rich meals in early pregnancy may加重 digestive burden and vomiting. Opt for small, frequent meals with light, easy-to-digest foods like porridge, breadsticks, steamed buns, and soda crackers.
2. Consume more vitamin-rich foods
   Ensure intake of vitamins and trace elements, especially folic acid, vitamin B2, and B6, from fresh vegetables, milk, soy products, meat, fish, eggs, walnuts, peanuts, kelp, shrimp skins, etc.
3. Diversify the diet and avoid picky eating
   Most women experience decreased appetite or taste changes in early pregnancy. Cater to the mother's preferences, avoid excessive restrictions or picky eating, and ensure food diversity for adequate nutrition.

Week 4 of Pregnancy:

This week, the fertilized egg completes implantation, and the germ begins to grow in the uterus. The expectant mother's body undergoes drastic changes, but externally there may be no obvious feelings, with no significant changes in body shape or weight. Some may experience mild discomfort, fatigue, or flu-like symptoms. Besides physical changes, psychological changes are also significant. After confirming pregnancy, worries may arise about pre-pregnancy medication, alcohol consumption, hair dyeing, etc.—generally, if the fertilized egg is unhealthy, it will not implant, so just follow pregnancy precautions from now on for a healthy pregnancy.

What Are the Pregnancy Precautions?

1. Maintain a healthy diet
   Affected by progesterone in early pregnancy, eating habits change easily. Choose light, fresh, digestible foods like vitamin-rich fruits/vegetables, high-quality protein from milk and eggs, and avoid foods with pigments, additives, or preservatives.
2. Avoid unprescribed medications
   Early pregnancy is critical for fetal development—medications may cause deformities. For fever, use physical cooling methods like hot compresses or fever-reducing patches instead of self-medication, and consult a doctor.
3. Avoid hair dyeing
   Reduce exposure to chemicals (e.g., hair dye) during pregnancy, as chemicals may penetrate the skin and reach the uterus, increasing fetal malformation risk. If dyed before pregnancy, cut hair short and wash frequently to reduce residual dye absorption.
4. Stay away from smoke and alcohol
   Quit smoking and drinking during preparation and early pregnancy. Smoking (including secondhand smoke) increases risks of congenital malformations and premature birth, while alcohol may cause miscarriage or birth defects.
5. Avoid cold drinks and caffeine
   Limit caffeine-containing foods (e.g., cola, coffee) to avoid affecting sleep, and reduce intake of raw/cold and high-sugar foods.
6. Avoid sexual intercourse
   The fetus is fragile in early pregnancy—avoid intercourse to prevent miscarriage caused by sexual activity.