His arm and neck muscles need to be strong enough for the move, and he needs excellent head control. (checkpregnancy.com)
As a guideline babies can go in a baby jumper once they have excellent head control. (thebestbabyjumper.com)
Pillows: We use intelliPillows in our home because they give excellent head and neck support and are made out of completely nontoxic and hypoallergenic materials. (thehealthyhomeeconomist.com)