Post partum Tretinoin conundrum

Tretinoin worked great for me pre-pregnancy - I mainly used it for aging and it helped me with blemishes, dark spot etc. I stopped using when I got pregnant. I am now 10 months post partum (done with breast feeding). I want to get back to using tret but here are my issues \- My baby touches my face and kisses me all the time so I don't want to use it during evenings or nights (we co-sleep) \- I can apply it when I leave for work in the morning or at work with SPF. Will this be effective? Will the sunscreen be sufficient to prevent sun sensitivity caused by tret? Please give me some suggestion!