Abortion, at any and all stages of the baby's development, is murder.
Call yourself a Christian if you would like, but you may well be fooling yourself. Either you believe the Word of God when God says that HE ALONE is the Author of every conception, or you do not believe in His Word, and its absolute authority over your life.
There is NO EXCUSE EVER that justifies murder, period, and the Lord will hold those accountable that support this evil.
And for those who call themselves Christians, and yet find reasons that are sufficient to justify murdering one that He has created, in His image, He will hold you accountable for taking His Name in vain.
I have seen the evil mental gymnastics that those who openly hate God use to justify this barbarism, but those who claim Christ are supposed to possess a wisdom that comes from God, and should therefore know better. While it is possible that a person can be indwelt by the Holy Spirit and be truly born again, and yet hold to wrong ideas, God will NOT leave that person alone who embraces such evil; He simply will not allow this in our lives.