After Kohen's 4 month check-up the other day, I was curious to see if big babies turned into big/tall grown-ups. Weighing in at 18 lbs. 11 oz. and with a height of 28 inches, Kohen is in the 95% for weight and is off the charts for height. To put this comparatively, he is the size of an average 9-month old. Unfortunately, the doctor said no solid foods for another 4 weeks, so the agony of two-per-night feedings will continue a bit longer as we struggle to feed this growing boy. Yep... we go through A LOT of formula.
Before diving into the "facts" available on big babies vs. big humans, if I compare Kohen to his older brother, who weighed almost an entire pound more at birth (7 lbs. 12 oz. compared to 8 lbs. 9 oz.), Kohen overtook his big bro after just a couple weeks in both weight and height. Both boys were born at full-term (40 weeks), were exclusively formula fed and didn't have any major problems with spitting-up. Keylen is now an energetic 6-year-old who is one of the tallest ones in his class and has a slim frame... a far cry from his far chunkier baby days.
Ok, jumping in. How do big babies stack up as adults later in life? In terms of weight, the biggest predictor of whether a chubby baby will become an overweight child is his parents' weight. Genetics play a very important role and serve as an indicator of what type of frame a child is predisposed to. A very chubby baby with overweight parents is more likely to become a bigger adult than a chubby baby with average sized parents. If you are worried about whether or not you baby's weight is climbing too quickly, pay attention to how quickly their height is also climbing. Weight and height should be directly related, but if one is climbing much faster than the other, you may have cause for concern.
What about height? Do long babies become tall adults? Again, we go back to genetics. How tall are the parents? Genetics play an important role in overall height of the baby. Some reports say that you can estimate your baby's future height by adding Mom and Dad's heights (in inches), dividing by 2, and then adding 2.5 inches for a boy, and subtracting 2.5 inches for a girl.
Let's try this out: Mom = 63 inches and Dad = 71 inches. (63 + 71) / 2 = 67 + 2.5 = 69.5
According to this calculation, Kohen will be around 5'10 inches tall; very plausible. A word of caution however, my parents are both of average height (around 5'8 and 5'10), yet my brother is 6'3... so there are, of course, exceptions to every rule. While old wives tales can be fun, patience wins out in the end (per usual) and you'll just have to wait and see.
My officially unofficial prediction: Kohen will grow to be 6'2.
For parents who are curious as to how their baby's height and weight stack up compared to national averages, here is a great Growth Calculator.