Week 13

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By your 13th week of pregnancy, your baby's organs, nerves, and muscles have formed and are beginning to work together to help your baby grow.

• This week, your baby is probably about the length of a lemon.
• Eyes and ears are clearly defined. Your baby's eyelids are fused together to protect her still-developing eyes.
• Tissue, which will harden into bone, is developing in your baby's head, arms, and legs.
• Tiny ribs might be visible.
• She's already on the move. Your baby might be moving her body in jerky motions as she flexes her arms and kicks her legs, but you won't feel her move for at least several more weeks.
• Vocal chords develop.
• Your baby's circulatory system helps clear toxins from her body.
• When you're 13 weeks pregnant, your baby's head probably is about half the size of her body.

What to Eat and Avoid on Week 13:

Eat  Fresh or frozen fruits and vegetables: They’re packed with vitamins and minerals, such as vitamin C, which helps your body absorb iron. Plus, they’re low in fat and are often a good source of fiber.  

Protein-packed foods: Foods such as lean meats, dried beans, and peanut butter are full of protein, which is essential to your baby’s growth.  

Fact: Different-colored fruits and vegetables have different levels of nutrients and vitamins. As a general rule, try to vary the types and colors of fruits and vegetables you eat every day.  

Avoid Soft cheeses: Avoid feta, Brie, and blue-veined cheeses unless the label indicates that they’re made with pasteurized milk. 

Shark, tilefish, king mackerel, and swordfish: These fish could contain high levels of mercury. Instead, eat fish that are low in mercury, such as salmon and catfish.

Source: http://similac.com/pregnancy/13-weeks-pregnant