Your camera height is too high..you are shooting "Down at her". Those stripes of sunlight on the grass behind are also distracting. These ARE however, good,sharp, clear renditions of their baby girl. Better than what many people would be able to achieve with their cameras or phone cams and limited photo knowledge. And so, the parents will probably like these, but they do lack the polish of a pro's photos. I understand why you are not shooting at the baby's level--background issues. Outdoors in park like that, or a yard, if you get the camera down to the baby's level and also properly keep the back of the camera parallel with the baby, you pick up....weird objects in the background....and so, to eliminate them, you stand up, and just shoot down at the baby, who is plopped on the grass on an obnoxious, pink-and-white, patterned blanket that clashes horribly with her dotted dress.
I think the best way to improve would be to try and get the camera's height JUST right, and on an infant, that means you're gonna be shooting while kneeling, or squatting, or sitting on your butt. Cute kid. She looks like a real photo-stealer!