I'm aware that the AAP recommends against using infant walkers: http://pediatrics.aappublications.org/content/108/3/790.full?sid=96b418c0-23d8-4209-9d40-54f67e2d721b

I'm not entirely clear on what qualifies as a walker, though. MIL wants to buy this for DD for Christmas: http://www.amazon.com/Fisher-Price-Bounce-Stride-Ride-Elephant/dp/B00JCA5DP6

It is very cute but I'm not sure the ride-along function complies with the AAP recommendation.