Her choice to have sex was her own personal decision and she shouldn’t be judged for that. However, being unprotected especially at such a young age and not being ready for the outcome that is likely to occur was irresponsible and showed off her immorality. Obviously Juno didn’t take in a whole lot of consideration at that point in time leading her to her pregnancy. Having sex in general when she said “Cause I got bored and had sex with you and I didn't want to like marry you?” in reply to Paulie Bleeker. Although this quote most likely wasn’t true considering Paulies’ rebuttal showed evidence that she wasn’t bored and could have had something else to do if she want. Juno also shows her immaturity a lot through her dialogue using sarcasm and witty comebacks to produce her character. Looking at Juno as an immature character during some parts she shows it through her recklessness, lack of plan, and lack of thinking things through.
Her decision to give up the baby was mature. Juno probably didn’t realize how big of a decision that should have been but saw that as her only option. The good that came by the end of the movie was Juno giving the gift of life “sweet, screaming, pooping life” to someone unable to