Rachel Zoe says parents need to put their foot down when it comes to their kids riding electronic bikes … ’cause her son was hospitalized after a bad crash.

The fashion designer took to Instagram this weekend to share her son’s plight … telling fans her 13-year-old son Skyler ended up with a “badly lacerated kidney, a ton of pain and a shattered mom” after an e-bike accident.

Rachel adds that her kiddo is in pain when he laughs or sneezes … and, she says there’s no way she’s ever letting him anywhere near an e-bike again.

Zoe says any parent considering buying their kid an e-bike better think twice about it … ’cause they spent hours in the ER after the crash. Worth noting, Zoe makes a point to say she didn’t buy him the bike — but, somehow he ended up on one.

Unclear exactly how Skyler crashed … but, he’s not the first celebrity kiddo to end up in the hospital because of an e-bike accident.

Remember, Pax Jolie-Pitt slammed into the back of a car while on an e-bike over the summer, law enforcement sources told us … and, he reportedly ended up in the intensive care unit.

The crash was so bad, eyewitnesses said they thought Pax died. Thankfully, he was released from the hospital a few days later. He ended up crashing into ANOTHER car while on an e-bike in January — but, he apparently did more damage to that car than it did to him.