Have a nursing/baby care room
Destigmatise the feeding of young children in public spaces, and provide a space to do it privately if people prefer.
It’s 2019. Feeding young children (whether breastfeeding or formula feeding) should be destigmatised, and acceptable in all conference spaces – including in talks and at mealtimes.
Some people will prefer to breastfeed in private, so you should have a clean, quiet, private room for them. At minimum, the room needs a table and a chair. Electricity and a fridge are nice to have as well. (This should be different to the quiet room.)