The baby brothers, who were two of a set of triplets, were found not breathing at a house in Bridgend.
There could be a legal challenge over the new motorway, a Labour AM claims.
Traffic in Newport is expected to be heavy this weekend as part of the M4 shuts and trains are reduced.
Richarlison scores in the 90th minute as Watford survive a Swansea City fightback to claim a dramatic win.
Cardiff City recorded a first victory in September as they returned to form at the Stadium of Light with a 2-1 victory.
South Wales Argus
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