JIP
No longer a newbie, moving up!
Comment on composition and technical aspects if you feel you have something to contribute. These pictures are very well taken and I'm sure the clients love them. This kind of comment is either a lack of any social filter or a deliberate attempt to offend. If you've ever been around children of this age, you would know that this child looks very calm and comfortable. They also don't sit up or open their eyes much. I laughed when I read this because it was so blatantly inappropriate.
I think the shots are excellent but I see nothing wrong with someone giving their opinion on them. It may seem a little strange but whatever people are entitled to state it besides I see no harm in saying something like that I don't think it was meant as some kind of insult to the baby or the photographer.