A Neonatal septicaemia.

[Feedback :- Septicaemia can cause DIC and bleeding, but this is normally around the time of the acute episode.]

B Complete oral (instead of IM) vitamin K administration.

[Feedback :- Oral vitamin K should be just as effective as IM if administered properly. Three doses (birth, 4–7 days and 1 month) are required, and failure to complete the course is now the most common cause of late-onset haemorrhagic disease in exclusively breastfed infants.]

C Formula feeding.

[Feedback :- Formula is supplemented with vitamin K.]

D Cystic fibrosis.

This is the Correct Answer

[Feedback :- Infants with undiagnosed cystic fibrosis can have malabsorption of the fat-soluble vitamins (A, E, D and K), and this would be the most likely cause of late-onset haemorrhagic disease in this list.]

E Hypoxic–ischaemic encephalopathy (HIE).

[Feedback :- HIE can cause DIC and bleeding, but this is normally around the time of the acute episode.]