Recently the guidance for those with children under 1 has changed. If your household includes a child who is under the age of one or was under that age on 2nd December 2020, you can now form a support bubble with one other household. It means you can have close contact with the other household in your bubble as if they were members of your own household, which might be really helpful if you are a new parent.
It also applies to families with a child under 5 who have a disability that requires continuous care.
Find out more here: https://www.gov.uk/guidance/making-a-support-bubble-with-another-household