I myself don't subscribe to universal infant salvation. This doesn't mean I oppose it. I tend to think it's a bit artificial, but it's a respectable theological option. For all I know (or don't), it could well be the case. Here's how two reputable Christian pastors argue for universal infant salvation:
I also think infant salvation is more likely in Christian families, although we must avoid the temptation to be presumptuous about the grace of God.