Husband scrolls phone while holding awake baby

He had him propped up on his legs and he’s looking at him and cooing. Baby is only a month old so not super interactive, but I’m worried it’s going to hurt his development having dad not fully engaged when he’s alert and watching. I go back to work in a few weeks and am concerned his development is going to be hurt when dad is watching him on paternity leave for 6 weeks. Any insight? Is it worth talking to him about even though baby is not yet fully interactive and responsive at his age?