69 kV-230 kV are referred to as âhigh voltageâ and voltages 230 kV-1,100 kV are referred to as âextra high. voltage,â with 1,100 kV also referred to as âultra high voltage.â The emphasis of this guide is on low and. medium voltage distribution systems.
Most manufacturers of umbrella strollers recommend that these strollers should not be used for any infant under 6 months old. This age is set by manufacturers because it is the average age when infants have sufficient strength to sit up and have some head and neck control.
You shouldn't jog with him until he is 6-9 months old, but ask your child's pediatrician as the recommendation vary widely. At 4.5 months you can probably put him in the stroller without the carseat if he is doing lots of tummy time and holding his head up. I have a BOB Duallie and LOVE jogging with my kids.