There are three English translations, one by . Brill in 1910, another by James Strachey in 1949 published by Imago Publishing.  Strachey's translation is generally considered superior, including by Freud himself.  The third translation, by Ulrike Kistner, was published by Verso Books in 2017. Kistner's translation is at the time of its publishing the only English translation available of the earlier 1905 edition of the Essays. The 1905 edition theorizes an autoerotic theory of sexual development, without recourse to the Oedipal complex.  
This is very much in line with Groos’s theory about play as practice. The boys played endlessly at tracking and hunting, and both boys and girls played at finding and digging up edible roots. They played at tree climbing, cooking, building huts, and building other artefacts crucial to their culture, such as dugout canoes. They played at arguing and debating, sometimes mimicking their elders or trying to see if they could reason things out better than the adults had the night before around the fire. They playfully danced the traditional dances of their culture and sang the traditional songs, but they also made up new ones. They made and played musical instruments similar to those that adults in their group made. Even little children played with dangerous things, such as knives and fire, and the adults let them do it, because ‘How else will they learn to use these things?’ They did all this, and more, not because any adult required or even encouraged them to, but because they wanted to. They did it because it was fun and because something deep inside them, the result of aeons of natural selection, urged them to play at culturally appropriate activities so they would become skilled and knowledgeable adults.
Attachment theory can also be linked to the way in which a mother bonds with her new born baby. However, these early bonds are not solely restricted to mothers, it is also possible for fathers. Although, this bond is typically formed within the first few hours after birth as the mother and baby connect both physically and emotionally. The initial bond that is made is thought to have a significant effect on their future relationship as it is the beginning of their 'attachment'. This knowledge enables social workers to support mothers who are particularly vulnerable to poor parenting, although this is only effective if the support continues throughout the first few months after the baby is born.. However, it is important to note that just because a mother fails to achieve an initial bond with her baby, this does not mean that abuse is inevitable.