I recently wrote about the work from Newcastle in the UK about supporting parents who lose one of a pair of twins during the perinatal period. Nick Embleton wrote a comment about that post noting that they now have put some of their resources on-line.
Apart from stealing the title of their website from this blog, (they call it neonatalresearch.net, which is such an obscure name for a website about research in neonatology that I am sure they stole it from me) as I say, apart from that, there is a page about their project on the loss of one infant from a multiple birth which includes the guidelines they are developing. They also have a teaching pack available if you fill in a short survey.