Children do not need socialisation, outside the immediate family unit, until about 2.5 - 3 years old.
I meet many parents who feel pressure to put their child in day care so they can develop social skills. Let me let you in on a tip, how we interact with our little ones is socialising them. Under 3's learn from their family's behaviour and interaction. Babies are emotionally bonded to the parents initially and are not mature enough to separate from that bond until about 2 and a half to 3'ish years of age. A toddler does not understand that when a parent leaves her child with another person and walks out the door, that she will come back. Under 3 years old, most children are not capable of articulating their feelings and each child will react differently. A toddler is likely to show separation anxiety, which will manifest its self in new and different behaviours. Some parents say that their toddler will get used to it. Repetition does not mean the child will become emotionally 'okay'. Emotional maturity is not something we can measure.
I strongly recommend reading " Raising Babies" by Stephen Biddulph.