Q&A: Kids lagging severely behind with milestones

Amy writes:

"Your post in response to the mom of the 7 month old was very helpful, as were the responses. But I'm wondering if you've heard from or could put out a call for responses from parents of kids who lagged considerably behind the "normal" milestone timeframes, and how they dealt with it/ how their kids turned out?

My daughter is 15 months. Even in utero, she only did little flutter kicks and never the crazy rib-pounding that other moms reported. She is a very calm, good-natured baby. She has never been very active--she has started rolling over in earnest only in the past month. She does not crawl.  She is good in the static positions of sitting and standing holding on to things, if you put her there--but the dynamic movements are slow to come. She also has no word-like sounds but does complex babbling and seems to have some receptive language: she will turn the page of a board book when I ask her to. She is cheery, looks healthy, makes great eye contact, is very interactive. So, no red flags for serious disorders that anyone can see. Medical evaluations have turned up nothing so far except slightly low muscle tone. We have a physiotherapist coming every couple of weeks to give us new things to work on-- but progress is slow.

She is not one of those large babies reluctant to move; she has actually dropped down to the 5th percentile and only recently tripled her birthweight of 6 lbs 5 oz. She does have a squint which I think is astigmatism, and I'm waiting for our appointment to get it evaluated. I think that's about all the pertinent info!

So I would dearly love to hear from parents of late bloomers--I can't be the only one out here, can I?"

Not the only one that I know of, for sure. There were two kids who sounded similar to your daughter's profile in my original playgroup, and one just seemed to be more laid-back at the beginning but was caught up and indistinguishable by 3 years, and the other ended up having some physical therapy for low muscle tone for a few years.

I know that's only an n of 2, so I'm hoping readers will chime in. Nothing about what you've written sounds any alarms for me that there are things going on that you're not catching. You've had her evaluated, are doing PT, are watching out for astigmatism, and is very interactive and has great receptive language. She may never be an Olympic athlete, but it sounds like you're aware of that, too.

Readers? Any data points for Amy or other things for her to think about, or stories of similar kids?