{"id":1287,"date":"2022-02-04T19:41:44","date_gmt":"2022-02-05T01:41:44","guid":{"rendered":"https:\/\/americanpregnancy.org\/?p=1287"},"modified":"2023-04-21T13:37:45","modified_gmt":"2023-04-21T19:37:45","slug":"13-weeks-pregnant","status":"publish","type":"post","link":"https:\/\/americanpregnancy.org\/healthy-pregnancy\/week-by-week\/13-weeks-pregnant\/","title":{"rendered":"13 Weeks Pregnant"},"content":{"rendered":"

13 Weeks Pregnant<\/h2>\n

Congratulations! The 13th week of pregnancy means you have one week left in your first trimester<\/a>. Here is what you can expect in the upcoming week. Get the Fetal Life App for Apple<\/a> and Android<\/a> endorsed by the American Pregnancy Association.<\/p>\n

What changes are occurring with your body during the 13th week of pregnancy?<\/h3>\n

You may not have begun to wear maternity clothes yet, but you have most likely replaced tight-fitting clothes with more comfortable clothing. Stretch marks<\/a> may be appearing on your abdomen, breasts, hips, or buttocks. Your morning sickness<\/a> may begin to subside at this point, but you may be experiencing more frequent heartburn<\/a>. You may also notice some distinct changes in your breasts<\/a>. By now your breasts might have become larger and may feel lumpy or nodular, which is caused by the mammary ducts as they begin to prepare for milk production. You may also have noticed veins appearing right under the skin on your breasts. Additionally, colostrum begins to form during the second trimester; this is the first stage of breast milk<\/a>, and it can be expressed from the nipple when massaged.<\/p>\n

What is happening with your baby during the 13th week of pregnancy?<\/h3>\n

Up until this point, your baby\u2019s head has been the largest part of his\/her body, but that is beginning to change. Your baby\u2019s head is now only about 1\/3 of his\/her body. Unique fingerprints are now located on the tips of your baby\u2019s fingers. The kidney and urinary tract are completely functional, which allows the amniotic fluid your baby has been swallowing to be excreted. Also, covering your baby\u2019s skin is a fine, soft hair called lanugo<\/em>.<\/p>\n

How big is your baby during the 13th week of pregnancy?<\/h3>\n

By your thirteenth week of pregnancy, your baby is almost 3\u00be inches (9.5 centimeters) long<\/strong> and weighs 1\u00bc ounces (about 35 grams)<\/strong>.<\/p>\n

What should you plan for the 13th week of pregnancy?<\/h3>\n

As women finish the first trimester, they may notice an increased libido. It is common for couples to wonder whether sex during pregnancy<\/a> is safe. Many don’t realize that the baby is protected by the amniotic fluid in the womb, by your abdomen, and by the mucus plug<\/a> which seals your cervix and helps guard against infection. For many couples, it is safe to engage in sex while pregnant. However, sex should be avoided if:<\/strong><\/p>\n