Symptoms of MSUD usually appear within the first few days or weeks after birth. More general symptoms include:

  • sweet-smelling urine and sweat
  • poor feeding or loss of appetite
  • weight loss

Babies with MSUD may also have episodes known as a metabolic crisis,sometimes early in their life. Symptoms of a metabolic crisis include:

  • lack of energy
  • vomiting
  • irritability
  • breathing difficulties

It's important to get medical help immediately if your baby develops symptoms of a metabolic crisis. Your doctor will give you advice to help you recognise the signs.

In some cases, a metabolic crisis may be triggered later in childhood by an infection or illness. The hospitalwill provide you with emergency treatment instructions to follow if your child is ill, which helps prevent these symptoms developing.

Content supplied by the NHS Website

Medically Reviewed by a doctor on 21 Dec 2018