I have a 13 month old girl and a 14 month old boy that have been with me since they were both 10 months old part-time for a month each until their parents went back to work, then full-time. The boy took 4 months to adjust and stop screaming every day and the little girl is doing really well after 2 months. I had a little girl who was only 5 months old start with me one time.

Every child has a different adjustment period, but you have to keep trying and being consistent day by day by day. It is really frustrating but the child learns by repetition and hearing and trying to do things over and over.

Be patient and keep doing what you are doing. Make sure the parents keep trying too and you'll get there.