• cystic fibrosis
• screening
• vitamin K

We would like to report a female infant (initially breast fed and subsequently formula fed) who had received two 1 mg doses of vitamin K orally, and presented at 9 weeks of age with large haematomas at the sites of her primary immunisations. Her weight had dropped from the 25th to 50th centile at birth to the 2nd centile.

Her haemoglobin was 720 g/l, white blood cell count 13×10⁹/l, …