it souldnt feel any different it is to soon for the baby to grow to considerably, you may notice some cramoing but it isn't to likely

Yes; if the "ly" ending didn't give it away, it's used to modify adjectives: considerably larger, considerably cheaper, etc.

Glasses vary very considerably in size.

Glasses vary very considerably in size.

Glasses vary very considerably in size.

Glasses vary very considerably in size.

Posterior superior alveolar nerve has no branches to supply areas where the patient can considerably feel the symptoms of anesthesia

We are considerably older than our children.