Childbirth charities are warning parents that hands-free breastfeeding or bottle feeding, when a baby is being carried in a sling, is unsafe.
The National Childbirth Trust (NCT) and the Lullaby Trust say the risks are highest for premature babies and those under four months old because their airways can be easily blocked.
Their updated guidance follows an inquest into the death of a six-week-old boy who was being breastfed in a baby carrier while his mother moved around their home.
A coroner's report to prevent future deaths like his found there was very little information on safe positioning of babies in slings or the risks of suffocation when feeding.