A flat head does not mean a child will wind up in special ed. A flat head would be considered plagiocephaly, where the baby's head is not symmetrical. A cranial helmet can correct this, and before doing that they should reposition the baby, especially when sleeping at night or napping to the non flat side to help reposition the plates of the skull. The child is still young enough to try this with!
If the child went in for a 6 month checkup, I am sure the doctor noted whether the baby is meeting developmental milestones or not, and prehaps she is just NOT discussing it with the family. I had a friend who knew at baby's 9 mo. check up her child was not crawling or even trying, and they were watching him, and under the care of a doctor but she was not ready to discuss the problems they COULD be facing and the doctor's concerns with anyone~to avoid discussion of the subject until an official diagnosis was made, and he does have a problem which they discovered in genetic testing.
The spitting up may be reflux, and she should ask the doctor about needing to switch formula or about possibly having medicine.
Now if she is not addressing these things with the doctor because she has baby #5 and you can't tell her anything, and is not concerned for the well being of the child, I don't know what to tell you. If he is under weight and seems undernourished the doctor should be watching and addressing this. You are right, how can he NOT see it?
I don't know that calling DCFS will help, if he appears to be living in a home with adequate living conditions. Like a previous poster said, it may not be great, but they may meet the guidelines DCFS has to follow, and dCFS will not be able to do anything. It may scare her to know someone is watching her. To be honest, I don't know what happens when they go in, if the DCFS person can question what he eats, the safety of the car seat straps, etc and address your concerns. Or if they just say we have a complaint....and inspect the home?
I'd see if the baby's dad can go to the next appt. and address concerns with the doc, if you can get through to him. Would she let you, or grandma go along?
Yes, she should be sending him appropriate stages of baby food, and no she should not go off to play bingo without at least asking another adult to mind baby, and yes, she should be concerned about his health and milestones he does not seem to be reaching. But I am not sure calling DCFS will get the response you are hoping for.
Please update us on what happens with this little boy, continue to love him, and bless you for caring for his well being. As a mom, do what you think is right.