Talk to Pediatric Nutritionist on Baby's Health And Feed

AoA, I think I have made a huge mistake regarding my baby's feed. Plz spare 2 minutes and read my problem.

I'm giving breast milk along with formula, as my milk was not enough for him. I give him 2 or 3 ozes ( points) , but he always cry at the end. People have been saying to me that even little is enough for him. He was 3.8 at birth time, now 4.3, three months old now. Today gave him 4 onces, he didn't cry for the first time afterwards. Is this mean he never got full.. I am so sad.

Moreover, I used to take hi-lacta, then I stopped taking it. Should I restart it.? I am also taking mammalac. Plz respond, I am extremely sad.