Mom guilt

I’ve been struggling with i think is mom guilt. I work mostly 5 days a week & usually 7 your shifts. I just hate leaving my baby granted he’s with his dad and i know he’s in safe hands i just feel like shit. He’s starting to smile at his dad and my grandma but he never smiles at me. well he does but rarely. i’m afraid he doesn’t like me anymore. i know he does but he act so differently around me then his dad. it breaks my heart. any advice ?