The tail of the fetus disappears completely this week and your baby begins to resemble a tiny person. The organs will continue to develop and the jaw will be formed as will the upper lip. The baby's eyes are now fully opened but as of next week they will close and remain closed until week 25.
The baby's head is still very big compared to the rest of the body. The inner ears are now ready and the outer ear will now begin to develop although the baby still won't hear anything for quite a while. The tissue joining the fingers will now begin to disappear and the fingers will separate, making them independent of each other. The urinary tract will now also be formed.
By the end of this week the placenta will be formed and the baby will be fed via the umbilical chord which is now also formed by three blood vessels which will connect it to the placenta. These blood vessels are well protected by a jelly like layer which completely surrounds them.
If you are using a folic acid supplement you can stop around this time as the brains and spinal chord are now complete. However, continuing to take this throughout your pregnancy will not do any harm.
In week 10 the hormone hCG is at its highest concentration and many women find this is when they experience the most acute symptoms of their pregnancy. After this period thing should gradually ease off as the hormone levels are reduced.
It is important to keep a close check on your diet at this time and unlike popular wives tales it is absolutely not necessary to 'eat for two'. It is better to eat a healthy and varied diet including plenty of fresh fruit and vegetables which are important but more so during pregnancy.