What age should a infant start have a bedtime?

My 3 1/2 month-old eats about every 3 hours until his last feed and then he usually sleeps through the night right after. But I'm wondering if it would be better for him to have a bedtime routine every dark. Any mommies or daddies out there have their babies on a sleep routine? If so, what time is an appropriate bedtime for such a young babe-in-arms?
I regret not starting my sons bedtime routine earlier than I did. I am a first time Mommy and be afraid to put my son down. I didn't begin a routine until he was 6months or so. WAY too late. But we own things going on now (11mo), it took about 3months for the routine to really sink in. It doesnt other go as planned, but mostly works.
As soon as they are born.
I'm one of those hardcore mother's that believes in sleeping and ingestion schedules and in my home no matter what at 8pm the babe-in-arms is put to bed and I will not feed or play/hold them until 10pm

this why when they are 1 and 2 they know 8pm is bed time! (this helps stop any fussing)
As soon as possible.
My daughters bedtime has be 7pm since she was very first born and she's now 11 months outmoded and it works well for us.
bedtime routine for my bubba boy almost 6months been doing this for about 3 months purely slowly brought things forward so he has a bed time

dinner veges 6pm
bath 6.30
massage 6.45
bottle 7pm-7,30
bed 7.30 - 8pm in general wakes at 7 am

we are teething at the moment so things have changed slightly
Answers:    Yes a bedtime routine would be fantastic. If you stick to it every night eventually he will get the idea that the series of events system that it is nearly time for sleep, meaning he will settle to sleep easier because he knows what to expect. It is never too early for a bedtime routine, around 7pm is a angelic time to have baby in bed, but it is not other possible. Maybe you could stick to what you are doing now and take notice of what time he is certainly going to bed for about a week and see if there is a pattern, after decide on a bed time based on that.

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