I placed my first boy in infant care for a month and he had a case of mild HFMD. He was 3 month plus back then. There were around 10 babies and about 3-4 caregivers , the caregivers were very nice and approachable, the only reason y i decided against infant care was after how i saw the babies sharing the toys in which they placed in their mouths... There was even one parent who just conveniently put his baby at the centre despite baby was having 38 degrees fever, just so that he could go for a jog. Of cos the caregiver immediately rejected him and asked him to bring baby to the doc.
So what im saying is that if you do decide to put baby in infant care or childcare, be prepared that baby may fall sick easily and mb often cos some parents still send their child to the centre and if the others have low immunity, they may just catch the virus. Of cos there are parents who have the mindset that its ok for their kids to fall sick as they may build immunity to that particular virus. But personally, as a parent, i feel heartache when he falls ill at such a tender age. you may want to wait for baby to be alittle bigger before you put them into such centres. Young babies falling sick often may mean inconvenience to you too.
As for nanny, make sure its someone reliable, best if its recommended by someone who have tried out the nanny.