It was limiting visitors to just one at a time, but would allow an additional support person for someone with a disability.
The board said newborns and children have a higher risk of catching RSV and becoming severely ill.
Hospitals across the country have postponed surgeries and are creating extra bed space for children as they deal with a sharp surge in the highly contagious winter virus.
At Starship, children under 14 are not allowed to visit loved ones.
The latest ESR data showed weekly visits to the six main hospitals spiked to a total of 2543 this year.
Last year, just 34 RSV cases were recorded between April to September.
MidCentral DHB urged anyone experiencing cold or flu symptoms, or symptoms of respiratory illness, to seek a Covid-19 test.
Anyone who was feeling unwell was encouraged to stay home and maintain high standards of personal hygiene, including coughing into their arms and regularly washing and sanitising their hands.
"If you require medical attention from a GP, please remember to call the practice first.
"Free medical advice can also be sought by calling Healthline on 0800 611 116."