Sippy Cup
Two-year-old Casey Shiepe (L) concentrates on his sippy cup and muffin as Democratic U.S. presidential candidate and U.S. Reuters/Jim Bourg

If parents are wondering why their little ones keep getting sick, check for mould inside the sippy cup caps babies use. Facebook posts of mouldy sippy cups have gone viral and parents are totally disgusted, concerned and outraged at the same time.

Like many other parents, Montreal-based Simon O’kanada wondered why his little son kept falling sick. He was shocked to find a thick layer of mould covering his son’s Tommee Tippee sippy cup, writes CBS Miami.

Marie-Pier S. L'Hostie, O’kanada’s friend, quickly shared photos of the mouldy sippy cup on Facebook that have become viral and have already received nearly 50,000 shares. Tommee Tippee France quickly set into action and sent a statement to BuzzFeed.

“The results support that when used with recommended liquids (cold, light fluids including water and non-pulp juices) and cleaned in line with instructions, there are no problems. Difficulties have arisen though when liquids that are not recommended for use in the cups have been used, like thick formula milk, pulpy juice and warm liquids. We also recommend that cups are not left for long periods before being cleaned,” read the statement by Tommee Tippee France.

Another parent, Penny Powell, added on to L'Hostie’s post, saying that parents should do something about the mouldy sippy cups problem as several parents have been reporting the same problem after opening the anti-leak of the cups. Powell added more photos of mouldy sippy cups that got shared more than 100,000 times.

Tommee Tipee UK also issued a statement to Tribune Broadcasting on Wednesday, stating that the mould issue is likely being caused by the use of non-recommended liquid, which includes thick formula milk, pulpy juice and warm liquids.

It apologised to users for the problem and assured them of following up on the concerns raised. It advised parents to clean the cups regularly and also indicated that the company may start making transparent valves to make sure that mold formation is immediately noticed and taken care of, writes Fox News.