An overweight infant: Time to worry?
© 2015 Roy Benaroch, MD
Megan wrote in: “My son is 6 months old, weighs 10.1 kg and 70 cm long. I am concerned about his weight as he doesn’t seem to eat and drink excessively. He can’t roll over and my GP said this is probably due to his weight. What do I do? Cut back on protein and replace with extra veggies? Could he have a health issue?”
For those of you more used to traditional units, that’s about 22 pounds and 27 ½ inches. For comparison, the average for a 6 month old boy is about 17-18 pounds and 26 ½ inches.
Megan wants to know, first, if there’s really a problem here. My definitive answer is: Maybe. Or, more accurately, no… but there might be later. Having a few extra pounds, now, isn’t hurting Megan’s baby. If he’s otherwise healthy and his development is normal and he’s being fed appropriately, I think it would be very reasonable to wait and see.
But if there are some habits starting now that in the long run might increase his risk for obesity, now would be a good time to address those. Megan said he doesn’t seem to eat and drink excessively, but I’d want to take a better history of his intake over a few days to see exactly what’s meant by that. Is he getting excessive calories? Is he drinking an excessive amount of mother’s milk or formula? Does he get cereal added to his formula, adding calories he doesn’t need? Megan asked about cutting back on protein and increasing vegetables, but is a good idea—though I wonder where he’s getting extra protein from. I’d try to use mostly veggies as complementary foods at mealtimes.
Another thing to ask about, and this can be a difficult question: has eating become the main pacifier or soothing activity? Some babies are temperamentally more difficult to soothe, and sometimes parents fall into a rut of always soothing with food—which can sometimes contribute to a lifetime habit. Many adults eat when they’re worried or upset, and sometimes we get our babies used to doing this, too. I’d ask Megan, what do you do when your son is upset or worked up?
Megan also said he cannot roll over, which to me is unexpected. I see plenty of chunky babies, but almost all of them roll by 6 months. I’d want to do a careful physical exam and developmental assessment, here, before blaming the lack of rolling over on his size.
The question was also asked, “Could he have a health issue?”—meaning, could he have some kind of medical condition be causing his excessive weight. There are some conditions that can do this, but they’re fabulously rare. Incredibly rare. Incredibly as in most-doctors-will-never-ever-see-a-case-of-this rare. So without other history or physical exam findings to suggest something like this, I don’t think it’s very likely.
The most important steps when I evaluate a baby whose growth is not as expected—too big or too small—starts with a careful history and physical exam, and then continues with following the baby closely. Watch those numbers over the next few months to see if they level out. Though there are no immediate dangers here, overweight babies are more likely to become overweight children who are more likely to become overweight adults. Now may be the time to make a few dietary adjustments to prevent a whole lot of trouble later. It’s not time to panic, but it is time to pay attention.