📚 Healthy Pregnancy Research Task for KS3 CIE Science | KS3 CIE 科学：健康怀孕研究任务
This research task supports KS3 learners working towards Cambridge Lower Secondary Science objectives on human reproduction and healthy lifestyles. You will investigate how a baby develops during pregnancy and what choices help keep both the mother and baby healthy. Your final task is to create an evidence-based guide using reliable sources.
本研究任务旨在帮助 KS3 学生完成剑桥初中科学课程中关于人类生殖与健康生活方式的学习目标。你将探究婴儿在怀孕期间如何发育，以及哪些选择有助于保持母亲和婴儿的健康。最终任务是利用可靠资料制作一份循证指南。
1. What is a Healthy Pregnancy? | 什么是健康怀孕？
A healthy pregnancy means the mother's body supports the growing baby while her own health is protected. It usually lasts about 40 weeks from the first day of the last menstrual period and is divided into three trimesters.
健康怀孕意味着母亲的身体在支持胎儿生长的同时，自身的健康也得到保护。怀孕通常从末次月经第一天起持续约 40 周，并分为三个孕期。
Good health before and during pregnancy lowers the risk of complications such as premature birth, low birth weight and high blood pressure. Key factors include balanced nutrition, regular antenatal checks, avoiding harmful substances and maintaining emotional wellbeing.
孕前和孕期保持良好的健康状况可降低早产、低出生体重和高血压等并发症的风险。关键因素包括均衡营养、定期产前检查、避免有害物质以及保持情绪健康。
2. Key Stages of Pregnancy | 怀孕的主要阶段
Pregnancy is split into three trimesters. Each trimester has different developmental events and different needs for the mother.
怀孕分为三个孕期。每个孕期都有不同的发育事件，母亲的需求也不同。
| Trimester | Weeks | Main developments |
|---|---|---|
| First | 0-12 | Organs begin to form; heart starts beating; brain and spinal cord develop. |
| Second | 13-26 | Rapid growth; bones harden; mother can feel movements. |
| Third | 27-40 | Weight gain increases; lungs mature; baby usually turns head-down. |
第一孕期：主要器官开始形成，心脏开始跳动，大脑和脊髓发育。第二孕期：胎儿快速生长，骨骼变硬，母亲能感觉到胎动。第三孕期：体重增长加快，肺部成熟，胎儿通常转为头朝下。
3. Nutrition and Diet | 营养与饮食
A balanced diet during pregnancy should include fruits, vegetables, whole grains, lean proteins and dairy or fortified alternatives. This provides the energy, protein, vitamins and minerals needed for the baby's cells to divide and grow.
孕期均衡饮食应包括水果、蔬菜、全谷物、瘦肉蛋白以及乳制品或强化替代品。这为婴儿细胞分裂和生长提供所需的能量、蛋白质、维生素和矿物质。
The idea of 'eating for two' is a myth. Energy needs increase only slightly, for example by about 200 kcal per day in the third trimester, but the quality of food matters much more than quantity.
'一人吃两人份' 的说法并不科学。能量需求只略微增加，例如第三孕期每天约增加 200 千卡，但食物的质量远比数量重要。
Foods to avoid include raw or undercooked meat, unpasteurised cheese, raw eggs and fish high in mercury such as shark and swordfish. These can carry bacteria or toxins that may harm the developing baby.
应避免的食物包括生肉或未煮熟的肉、未经巴氏消毒的奶酪、生鸡蛋以及鲨鱼和剑鱼等含汞量高的鱼类。这些食物可能携带细菌或毒素，对发育中的婴儿造成伤害。
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