Jacob's Update

26 weeks (this one is a little late)
Your baby may weigh about two pounds now and is 14 inches in length.
To support the fetus's growing body, the spine is getting stronger and more supple. Though no longer than the span of the average adult hand, it is now made up of 150 joints, 33 rings, and some 1,000 ligaments.
Air sacs in the lungs form now.
Lungs begin to secrete a greasy substance called surfactant. Without surfactant the fetal lungs would stick together and couldn't expand after the baby is born.
Although they've been sealed shut for the last few months, your baby's eyes are opening and beginning to blink this week. Depending on ethnicity, some babies will be born with blue or gray-blue eyes (which may change color in the first 6 months of life) and some will be born with brown or dark eyes.
Retinas begin to form.
Brain wave activity for hearing and sight begins to be detectable.
Fetal brain scans show response to touch. If you shine a light on your abdomen, your baby will turn his head, which according to researchers, means his optic nerve is working. (that is just way cool!)

27 weeks
Your little one's brain continues its rapid growth. Don't forget to share music, conversation, and even books with your baby! (oh my, I'm so behind! Adam might be concerned if he comes home to find me on the couch reading to my belly!)
Response to sound grows more consistent toward the end of the seventh month, when the network of nerves to the ear is complete. Your baby's hearing continues to develop, he may start to recognize your voice as well as your partner's. (how fun! Adam talks to my belly a lot.)
Lungs continue to grow and prepare for functioning outside of the womb. Each day in the womb greatly increases survival rates!
He also continues to take small breaths and although he's only breathing in water and not air, it's still good practice for when he's born.
Eyelids are now open more. Your baby can distinguish between light and dark.
Retinas have formed.
Average size is now 14.4 inches and 1.9 pound.