As we all know pregnancy is divided in three trimesters. The first trimester is from the last day of menstural period till about 13 weeks. The second trimester starts from week 14 to till the end of week 27. So the second trimester is considered as the golden period of the pregnancy because the discomforts of the first trimester have actually by now disappeared and all the major troubles of the third trimester have not yet begun. By the end of first trimester the fetus is actually about 5 inches long and it weighs about 50 grams and by the end of second trimester the fetus weighs roughly about 1 kg and 14 to 15 inches long. This is the time when major organs of baby have developed. The heart is functioning. The lungs are developed. The baby has toes, fingers along with nails on it. The baby's ears have developed by 18 weeks and they become sensitive to the sounds by week 22. They start responding to the sounds by about 24th week. Mom's voice makes baby alert so i...