I have 3 DCs. All 3 of them were in nursery FT at 6 months.
When I went back to work after dd was born 14 years ago, I had quite a number of people "concerned", "worried" and "trying to help"
It upset me to the point I began questioning my own decision. Only for a while. Until I looked at my dd, happy and well cared for in nursery, looked at my life, I am very happy in my career, I wouldn't dream of expecting DH to work excessive amounts of hours each week, never spending time with his family in order to support me, when I can do that perfectly well myself and Realised that what other people said was irrelevant.
I do not feel the need to consult my neighbour, checkout person in tesco, person at the school gate or any other random person about life decisions like which house to buy, which car to buy, whether to change jobs, what colour carpet to have, whether to try for a 3rd baby, which mortgage provider to use, nor have I ever come across any of these random people feeling the need to give me this advice.
Therefore my childcare decisions are mine and DHs. No one else has the right to assume they need to "help" or "suggest"
When ds2 went into ft nursery 8 years ago, I still had the same "helpful" comments. But this time I just explained that had I needed advice, help or suggestions from people I wouldn't trust to look after my goldfish then I would have asked. But as I did not,could they kindly concentrate on their own lives and leave me to do the same.