No he is not too little for daycare. Putting him in daycare two days a week a few hours in the morning, will be good for him. I worked in daycares so i know that there are some children who cry for mommy and it is heartbreaking both for the teacher and the parent to deal with, but eventually the child gets used to their caregivers and the caregiver usually distracts the child with a toy or reads them a story or gets him/her involved in an activity.
When i worked in a daycare - we had an infant room (6mos +) thru to preschoolers (5 years) and as i recall when one baby joined the infant room he was 6mos old and the mom would stay with him in the infant room (for a little while) to get him used to the interraction between the other babies and the teachers.
I think it is absolutely beneficial for children of any age (even babies) to have some kind of interrraction with other children, at a daycare, or at a parent-child activity programs, this gets them socializing and interracting and getting along well with other children.
And parents of infants as young as 6months old - this includes you too, babies may not be interracting with each other as toddlers or preschoolers do, but they are aware of the fact that other children are around them and even at the age of 6 months old they are capable of learning - at that age and through the preschool age - they are sponges, they learn and mimic what others do, even if they are too young to verbalize, they know and they are watching and "understanding"