I'm a little disheartened at this conversation.
The thing I love about Anglicanism is that it gives you choice while retaining a common history and liturgy. Baptism is one of the choices the church allows and has done so for at least a decade, although looking at the 1979 BCP it seems it went back even to then.
Infant baptism is NOT a mandate or requirement in the Anglican church. You can practice it, you can celebrate it (I will celebrate infant baptism as well) but it should be the parent's choice. Scripture points to believers baptism; Anglican tradition points to infant baptism. Even if apostolic tradition is where infant baptism came from, there has NEVER been a condemnation of believer's baptism in the Anglican church and none of you should condemn it either.
Here is the thing - the Anglicanism that you are saying gives us a choice about this was invented in the 20th century, the latter part of it. It goes along with a great many other issues they have decided to stop thinking about in any kind of coherent way, and the idea that whatever makes people comfortable is ok.
That is to say, it is part and parcel of the crises within Anglicanism. That is why it is hard to take it seriously as an "Anglican theological position". It has no theological thought involved like many other decisions made in this period. I say that as someone who thinks it is necessary to baptize, but I think my criticism is true here even if I am wrong about that. Anglicanism has failed to make any kind of effort to think about what is theologically correct in this instance as in others.
You cannot hold to the traditional understanding of baptism held by Anglicans and then casually say "well, it is ok to dedicate your infant and baptize later." The two ideas cannot reconcile. Either it is indifferent when we baptize, or it is important, we can't say it is both. The baptismal liturgy - at least the older versions - makes it clear why we think it is important to baptize infants, as soon as possible. Not just because of the washing away of sins - after all even Christ, who was sinless was baptized - but because it is baptism which incorporates us into the Body of Christ and gives us grace which we otherwise would not have to amend ourselves. Infants as they grow older need that Grace as the rest of us do and they can be part of the Church as the rest of us can.
If we really believe that, not baptizing an infant is grossly negligent.
Nowhere has the Anglican Communion said they do not believe that it is through baptism these things happen, and making a change in doctrine of that kind would not be something that a national church like the CofE could decide alone. It would have to come before the whole Communion.
The situation seems to be that the baptismal theology of the Anglican Communion remains the same, and for some reason some national churches are failing to teach that and in fact developing ceremonies that provide other options.
I am not all that inclined to take the "teaching" of rogue elements as telling me what "Anglicanism" says about baptism.