Formula. Please no judgement

Hi ladies, I was wanting some advice on formula for babies who tend to get constipated. My LO is a month old and is seeming constipated (fussy, stool was clay-like today) please no judgement or being told how bad formula is. Due to health issues I couldn't keep a milk supply no matter how hard I tried & it was devastating for me. Anyway right now he's on enfamil newborn which has been amazing...he's only spit up twice ever, but now I'm wondering if it's constipating him. I have a sample can of gentleease that I'm considering trying, but would love input from other mamas! Thank you :)