Hilary Duff's daughter Mae, 16 months, has hand, foot and mouth disease - details

The HIMYF stat has three children

Hilary Duff is in unchartered waters as she revealed that her youngest daughter Mae is battling an illness that neither of her two other children ever suffered from.

MORE: Hilary Duff details 'traumatic' night with baby daughter

The How I Met Your Father star shared on Instagram that the 16-month-old has hand, foot and mouth disease, and her appearance left her mom shocked. "None of my other kids have ever had hand, foot [and] mouth, so I've never it seen before. That looks awful," she said.

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According to the CDC, hand, foot and mouth disease is a mild viral infection common in infants and children younger than five years old. Symptoms include mouth sores and a rash on the hands and feet which can last between seven and ten days.

Hilary is currently filming season two of HIMYF so was unable to be with Mae as she was working on set – but gave a shoutout to "working parents" who go through the same emotions when their child is sick.

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She added on her Stories: "I haven't been able to be with her all day because I'm at work. I love my job so much, but this is just a little shoutout to working parents who have to leave their kids in times that don't feel natural.

"And it kinda like goes against everything in their body to not be with them in times like that," she added.

Hilary's daughter Mae has hand, foot and mouth disease

Hilary shares Mae and daughter Banks Violet, three, with her husband Matthew Koma, who is also stepdad to the star's first child with ex-husband Mike Comrie, Luca Cruz, ten.

Soon after giving birth to Mae, the actress spoke to People about the pressures of being a parent to three, saying: "I have help, but babies just want their mom. Even Luca is still like, 'Mom, Mom, Mom.' Mom cooks the thing the right way, and Mom packs the bag the right way. It's crazy."

She added: "It's a learning curve to throw a newborn into the mix. A lot of people have been like, 'That third kid really gets you.' And they're right!"

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