Oh that is a stressfull one! 3-4 days a week for 2 months I would think he should be used to your house by now. Is he walking? Do you suspect anything medical? I know when we have a new one who cries the first few days it is horrible for everyone, stresses the other kids out, the dogs and cat out and especially me! Which in turn makes me short with the others! Have you told the mom at all that he cries all day? Are you reliant on that pay check or could you do without till a new kid can fill that spot? I think I would personally encourage the parent to find other arrangments. I once had a 6 mth old who all she did was cry the first 9 mths of her life, the mom said it didn't doesn't matter what you do she will cry! It was horrible you couldn't put her down, so I went and got a umbrella stroller and pushed her all over the house with me. Maybe that might work? Good Luck!