Toy Slime

What is it?

Toy ‘slime’ is generally bright in colour and sold in a plastic pot. In July 2018 the UK consumer group ‘Which?’ found that eight out of 11 slime toys tested contained higher levels of a chemical called boron than is allowed in the EU. The boron found in slime toys comes from a substance called borax, which is added to toy slime to maintain its texture. Borax is also commonly found in detergents, enamel glazes, insecticides, and is used as a preservative in some contact lens solutions.

The information in this document is written for pregnant women who have handled or swallowed the brands of toy slime for which safety concerns have been raised. Details of these specific slime toys  can be found on the ‘Which?’ website (clicking here should take you directly to the report).

Will contact with toy slime in pregnancy harm my baby?

In general, products which are not made by an approved manufacturer should be avoided as they may not have gone through the recommended safety and quality control checks and could therefore contain harmful substances. Particular care should be taken with products sold via the internet or from market stalls.

Handling toy slime: Borax in toy slime cannot easily pass through unbroken skin. The amount entering the mother’s bloodstream and potentially reaching a baby in the womb is therefore expected to be very low and unlikely to cause problems. Although women are advised, as a precaution, to avoid handling slime with high levels of boron if pregnant, no treatment or testing is needed if handling has already occurred. 

Swallowing toy slime: Swallowing toy slime may result in borax poisoning (toxicity), depending on how much is swallowed. Symptoms of borax toxicity include diarrhoea, vomiting, kidney problems, skin inflammation and blistering, coma and convulsions (fits). If you experience any of these symptoms after swallowing toy slime, seek medical help immediately as early treatment can limit or prevent serious problems associated with borax poisoning.

One small study in humans showed that women who were exposed to boron in drinking water did not have a higher chance of having a miscarriage, stillbirth, early delivery, a baby with a birth defect, or a low birth weight baby compared to unexposed women. However, animal studies have not been able to rule out that ingestion of a chemical similar to borax may be linked to birth defects in the baby.

Will my baby need extra monitoring during pregnancy?

As part of their routine antenatal care most women will be offered a scan at around 20 weeks of pregnancy to look for birth defects and to check the baby’s growth.

Handling toy slime during pregnancy is unlikely to cause any problems that would require extra monitoring of your baby. There is, however, not very much information on boron poisoning in pregnancy. If you swallowed toy slime early in pregnancy while the baby was still developing your doctor may offer you a more detailed scan.

If you have swallowed toy slime and experienced symptoms of toxicity (see above), additional monitoring to ensure that the baby is growing and developing as expected may be recommended.

Are there any risks to my baby if the father has used toy slime?

We would not expect any increased risk to your baby if the father had contact with toy slime before or around the time you became pregnant.

Who can I talk to if I have questions?

If you have any questions regarding the information in this leaflet please discuss them with your healthcare provider. They can access more detailed medical and scientific information from www.uktis.org