routine question

I am not the mom to push a schedule or routine on their child. My daughter is 4 months and I know a sleep regression is either in place or coming. Plus I went back to work so big change for her. However, her self created routine/schedule that I've also been consistent with she is now pushing against even with the sitter. Is this just part of the 4 month regression? It's a wacky routine as far as naps and nursing/bottle.