My DS loves his Johnny Jump Up, so it is with a heavy heart that I bring you this piece of info.
I have a good friend who is an occupational therapist. She also watches DS one afternoon a week and knows how crazy he is about jumping. But she just told me that OT's are preaching against Johnny Jump Ups and the like because it's more likely that a baby will skip crawling (which is very important for proper development in a lot of areas) if his legs get stronger before his hips/core do. The hips will not learn stability if the legs get too strong, thus the core suffers.
Bummer, but I thought it was important info to share. We will probably still let him use the JJU, just not nearly as much as before. And I'll have to be more proactive about tummy time.
Re: Caution: Johnny Jump Up/Jolly Jumper/Etc.
If it makes you feel better, all of my babies used it, DS2 especially loved it, and they all crawled/developed normally. I think that there may be some parents who use it too often. Everything in moderation!
First round of Clomid in May 2012= BFP #1, DD born January 2013
BFP #2 in January 2014, DS born September 2014
When my kids started getting really crazy in it I would change the setting so their feet barely touched the floor. Then they couldn't get it going as rapidly.
First round of Clomid in May 2012= BFP #1, DD born January 2013
BFP #2 in January 2014, DS born September 2014