This tweet, believed to be from a 17-year-old Liverpool fan, allegedly targeted Newcastle United defender James Perch after the two sides met on Sunday.
A call about the abuse James Perch allegedly received was made to Northumbria Police, but because the complainant was from County Durham, officers from that force will take up the issue.
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Police were called to an address in Carlisle on Friday night but the eight-month-old died later in hospital.
Jamie Vardy scored for a record-breaking eleventh game in a row as Leicester were held 1-1 at home to Manchester United
Gales near coasts and on hills.