I am a Mom of 3+. Their ages are 15 years, 9 years and 7 months. I also have a 18 year old step daughter. I have been quite lucky in the fact of not having to put my kids in a corporate/ public daycare. I was lucky to have parents who were able with my older son as well as close friends as needed. I have put them in preschool for the socialization. I also worked in daycare quite a bit at home and at facilities.
First, as you are adjusting so is your infant. It does take some time for him to get used to everything from different smells, different air, different ways of being held as well as different voices and noises. Although it may seem strange, he is used to the normalcies of home. As insignificant as they seem to us these are your angel's whole world.
Speaking from a daycare provider's point of view, we need to know what we can do to make the relationship between us, parents and child work to the benefit of all involved. The only way to make this happen is to have honest and open communication with the parents. Your providers should be more than willing to listen to your concerns and help to provide the outcome that you are looking for. The provider should welcome your comments and advice on how you want things done with your child. As a parent you need to also be open to their comments and suggestions as well. You may be seeing something that is coming out of your quilt and uneasiness of having to go back to work so soon.
Speaking as a mom, if your concerns and advice are not being met with this type of attitude you should really find a new provider. You have a mother's instinct and if you don't feel that your child's needs are being met to your satisfaction than you need to move on. Your son can not advocate for himself and you have that responsibility. I have seen what goes on in some daycares and would not leave my dog there. You need to search yourself, give yourself some time and find the best route for you to take. Remember to always believe in yourself and your methods of raising your precious angel. Who cares if you are "that Mom". Your son would probably appreciate you being "that Mom". That is the only one you need to be concerned with and if your provider doesn't see it that way than that's okay and maybe it is okay that you search out other alternatives for daycare. Maybe a home daycare would be better for what you are looking for. Remember that no matter how wonderful a provider is there is nothing like a mother's love. If you can cut some corners and budget differently to stay home for the first few years that would be the best in my opinion but if you can't than you need to find a person who you can feel confident and good about leaving your son with. I hope this helps you. I know how hard it is. I have been on both sides of having to work and being able to stay home. Although my older son was with his grandparents it was still very difficult to leave him.