We would say that the man child is Jesus Christ for the following reasons:
1. The Dragon (Satan) is said to have been ready to devour this child as soon as He was born. This is what happened when Jesus was born and Herod ordered the slaughter of the male children.
2. The child is said to 'rule all nations with a rod of iron.' The very same words are used to describe Jesus in Revelation 19:15. Similar languge is used in Psalms 2:9 with reference to the Son of God whose birth was being anticipated.
3. The child is said to have been caught up to God and His throne. This was clearly fulfilled when Jesus ascended into the heavenlies and 'sat down at the right hand of the throne of God' (Hebrews 12:2.
We would add this aditional point: Revelation 2:26-27 says, 'And he who overcomes, and keeps My works until the end, to him I will give power over the nations—27 ‘He shall rule them with a rod of iron; they shall be dashed to pieces like the potter’s vessels’—as I also have received from My Father....' In this passage, Jesus seems to be applying the prophecy of Psalms 9:2 to all believers who overcome rather than to Himself alone. This means that the man child could also be referring to the body of born again believers. After all, doesn't Satan do His best to devour every newly born believer before he or she can get firmly establsihed in the faith? And isn't the destiny of all born again believers to be caught up to God and to sit on His throne just has Jesus has done? We must remember, however, these promises are not to all who are born again, but to all who live a victorious overcoming life in the Lord.