MOving to Nairobi with young children

Hi there, my husband, me and our two very young children (2 yr old and 4 month old baby) may be moving to Nairobi. I would like info on health and safety considerations for our children such as vaccinations, malaria and other diseases, drinking water etc etc. Also, advice re facilitiies available for entertaining chidlren such as play dates, play parks, mum and children play groups etc. ALso, advice re buying kit for setting up with kids out there such as cots, car seats, toys, chidlren's clothes etc etc. Thank you!