A consortium including cafes, restaurants, pharmacies, shopping centres, and professional bodies have vowed to display the sign prominently.
The welcome sign was developed by the First 1000 Days, a movement led by Danone Early Life Nutrition to help change Irish attitudes to breastfeeding in public.
Just 56% of new mothers in Ireland have tried breastfeeding, compared to 96% in Australia and 81% in Britain.
The National Maternity Strategy, published earlier this year, said a broader societal change was needed to promote a more positive culture around breastfeeding.
The breastfeeding sign is supported by the Irish Nutrition and Dietetic Institute, the Irish Practise Nurses Association, and the Irish Paediatric Association.
‘First 1000 Days’ ambassador, business owner and restaurateur, Neven Maguire, said he and his wife, Amelda, would display the sign throughout their guest house, cookery school, and restaurant in Blacklion, Co Cavan.
“We feel passionately that all guests should feel comfortable and welcomed during their visit,” said Mr Maguire.
Other well-known businesses who have already agreed to display the sign include Insomnia Coffee Company, Boots Ireland, and Arnotts.
Chairman of Insomnia Coffee Company, Bobby Kerr, said the sign would let all families know Insomnia cafes were welcoming and supportive of breastfeeding mothers.
Arnotts management said they recognised that it took a lot of organisation to take a baby on a shopping trip and wanted to make each expedition a happy and stress-free experience for all mums.