I admit this post is a bit late, but it's here none-the-less.
Last week we had a second ultrasound. We took Elizabeth and Jonathan with us, and Joshua's mom was also in attendance. The kids like to see the "baby in mama's tummy" and I hope it's helping Jonathan to understand why bouncing on mama is not such a good idea.
After the technician looked for some vital markers we got down to business: finding out the gender.

Baby did NOT like having an ultrasound machine wand poking around, and baby was very mobile! As to the gender we aren't a 100% sure. In one shot we saw what appeared to be girl parts and in an other we saw what appeared to be boy parts. (We are leaning towards boy.) No boy names picked out yet but we do have a girls name.
Elizabeth has said some cute things regarding baby #3, such as: "I want the baby to be a big brother" and "I want a baby brother AND a sister" (there's only 1 baby in there!) Elizabeth has a friend in her class at church who recently got a baby brother. Her friend also has a big brother.