A young mother who bought her daughter’s car seat from a UK online retailer has sold the seats after her son, aged five, found them in his car.

In a post on Facebook, Mackenzie’s sister, Lizzie, wrote: “I have had a lovely life since Mackenzie was born, my kids love riding their bikes and spending time in the garden and now I am selling these as a gift for the man who took my daughter from me.”

Lizzia Childs, who lives in Wigan, England, says her sister had bought the seat in March last year.

“I had seen an advert on the back of the car seat and thought, ‘Oh, that’s good for me’,” she told the BBC.

She posted a picture of the seats on Instagram with the caption: “My little girl, Macky, and her friend have all been enjoying the ride for the past few days and she loves the seat!” “

When she got older she had a lot of fun and enjoyed it and we thought it would be nice to give her a seat for her five-year-old and her friends to ride in.”

She posted a picture of the seats on Instagram with the caption: “My little girl, Macky, and her friend have all been enjoying the ride for the past few days and she loves the seat!”

The posts prompted the mother-of-two to share more than 1,000 images of the seat on social media.

“My kids loved it and I couldn’t believe how much they loved it,” she said.

“They got in the backseat and it was so quiet.

I said, ‘That’s fine, it’s for the boy’,” she said, adding she was unsure how much she would sell.

“If you see it on eBay and you think, ‘that’s nice, it can’t be too much’, that’s how much I will pay for it.”

The mother-to-be said she bought the car seats for her daughter after she realised she would need them for her son’s future.

“He is going to be four and I think he will have to grow up a bit and it’s a shame that he will need to do that,” she added.

“It’s not fair, I love him, I adore him and I just think it would have been nice to have a seat on the front of his car for him.”

Mackenzie, who has three other children, was born in September 2015 and has been riding her bike for the last two years.

“She has been the same since she was born,” Lizzy said.