drugs, antibiotics and analgesics (such as paediatric paracetamol) are prescribed in dosages that are calculated in relation to the infant's body/birth weight (Hutton & Gardner 2005). Should a drug calculation error occur, this can be potentially catastrophic for all involved. Where two practitioners, one of whom is a registered professional, check the drug calculation independently, this helps to minimise drug errors. However, as a safeguard measure, both individuals need to be competent in basic numeracy skills, and able to undertake drug calculations independent of numeracy aids such as digital calculators. Indeed, NMC guidance points out that ' the use of calculators to determine the volume or quantity of medication should not act as a substitute for arithmetical knowledge and skill ' (NMC 2007). Consequently, registered and student midwife practitioners need to be confident and competent in their numerical calculations, and this also includes recognising when they need additional support in developing or enhancing their existing levels of understanding. Not everyone feels confident in their arithmetical abilities and, with this in mind, MIDIRS is delighted to present Dr Christina Butenuth's new resource, Numeracy for midwives. The MIDIRS website is provided for reference information only. MIDIRS is not responsible or liable for any diagnosis made by a user based on the content of the website. Although great care is taken to ensure reference information is both suitable and accurate, MIDIRS is not liable for the contents of any external internet sites referenced, nor does it endorse any commercial product or service mentioned