Yes, I remember him sitting at the park with his friends. They were talking about school starting and the bbq. They told Malik to stop looking at his phone and he said, "you would stare at her too if she was yours." Obviously we think he is talking about a girlfriend, but then we see him adjusting the camera over the babies crib so we know he was looking at the baby. I think the person suggesting the baby is Deja's is thinking that all the scenes we saw of Malik, his parents, working at the garage, the baby etc. are current time. The very last scene we see of Malik cooking burgers and talking to Deja is about a year in the past (as well as the scene of Randall asking Deja what was wrong with her face). This would indicate he met Deja at the bbq (a different bbq than the one they talk about in the current timeline), then they got pregnant. I am not 100% convinced the baby is not Dejas.