There are many groups available for supporting bereaved parents such as Cruse. There are others who help specific needs of different causes of child death, The Miscarriage Association, Neo-natal, Murdered children and Survivors of Suicide, are just a few. To find a group which might be able to help you just type a keyword or two into your search engine.
The Compassionate Friends offers support to all family members and has within it other sub-groups for instance a Siblings support network that can help your other children cope while you can be helped at the same time. To find out how they can do this click on the link on this page.
Another website you might want to have a look at is Saying Goodbye http://www.sayinggoodbye.org.
This is an online help source for parents whose baby dies during pregnancy, at birth or very young.
It is run by the Mariposa Trust and offers church services throughout the UK and North America. Go to their website and click on the link ‘list of services’to find the dates and locations of their planned services.