Will Karo Syrup Break the Cycle?

Vivan had her 6 month check-up, and and she got a good bill of health. We talked to the doctor about her lack of sleep (at night), lack of nursing/bottle/solids, and lack of pooping. The doctor thinks the latter is what's holding up progress: if she is constipated, then she doesn't want to eat much, and tries to make up for her lack of calories in the middle of the night (I still get up twice a night to nurse!). She recommended giving her a daily teaspoon of Karo syrup to help her get "regular" so she will take more solids/milk during the day, and consequently sleep longer at night. Sounds good in theory, right?

Here's Viv's vitals:

Weight: 14 lbs, 14 oz (down to the 26th percentile)
Height: 27 inches (up to the 90th percentile)
Head: 41.2 cm (20th percentile)

Looks like we're destined to have long, skinny babies!