Under 2 year olds don't benefit from nursery at all unless they're from linguistically or financially deprived households or their sahp is disengaged.
If a sahp talks to their child and involves them in every aspect of their day (the old fashioned "mummy's little helper" whole talking, talking, talking about everything, reads to them daily plus gets out and about each day for a walk, to the shops, and ideally to a toddler's group or to play at a friend's or family member's house with children, they will do at least as well as a child in nursery.
Children of 3+ benefit from a nursery or preschool setting arguably, but under 3s don't unless coming from a below par home environment (which may be due to financial restraints or illness, not the parent's fault necessarily).
There's nothing wrong with nursery and a good nursery is as good as a sahp too - but not better than an engaged, motivated, fairly well educated sahp.
No need to put an under 3 into nursery unless the parents need to work or need the time to recharge.