I personally strongly recommend sending your kid to a daycare up to 3 days a week starting when they're about 6 months old. I've heard that before 6 months, it can be stressful, but after 6 months, they can get very attached to only the people they know, and not accept anyone else anymore, which can be a problem with babysitters, family, play dates, etc.
So get them used to meeting other kids at an early age. It's great for their social development. Of course individual kids may vary, but it's a good thing to keep in mind.
So get them used to meeting other kids at an early age. It's great for their social development. Of course individual kids may vary, but it's a good thing to keep in mind.