Blakeman said that she read the book in a single sitting, before "crying her eyes out".
The film includes the themes of bullying, youth crime, domestic violence, unwanted pregnancy, and teenage angst.
For Blakeman, April's "heartbreaking journey in searching for her real mum is also about being brave enough to let love in."
Tom Sutcliffe, writing for The Independent, spoke of the limits of taboo themes in family dramas, and said the film's "account of a life lived in care couldn't have had swearing, or casual drug use, and when a shadow fell over a child's bed at night, it wasn't the care-home manager coming to exercise some horrible droit de seigneur [sic], as it might have been in an adult drama".
The film also addressed the theme of Asperger syndrome through the character of Poppy.
The BBC claimed that Clark, who has the condition herself, was able to offer "a unique take" on the role.
Steveson summarised the themes of the film, saying that "At the centre of the story, Marion finds out that she loves this girl.
And that is an amazing liberation when you discover someone more important to you than you are.
That is what is incredible about becoming a parent – you care about your child more than you care about yourself."

On Behind the Bin, a making-of documentary about Dustbin Baby, Wilson said that "lots and lots of people will identify with" the central theme of adoption, as at fourteen "you start to look at your mum and dad and think 'I'm nothing like them', and everyone seems to have fantasies about that they were adopted or something, and so I think that it's a typical teenage thing that you question who you are".
Richards says that she likes the idea that April "went on a journey to try and find herself" as "a lot of people [her age] try and do that because a lot of people get to the point where they're not really sure who they are any more".
Richards also discusses the motif of April's paper dolls, saying that April can relate to them as in different places, she is "still the same person", but that she is "coloured in differently by different people and different surroundings".
Alexandra Hewett, who played the Young April, described the dolls as April's "only real friends".

Stevenson described the character of Marion as "cranky, stubborn and lonely", saying that living alone has made her "become quite idiotic and eccentric".
When the character of April arrives, Stevenson explains that "Marion has to go from nought to 80 in terms of parenting.
There are lots of reasons she wouldn't get it right" which leads on to the guilt and anxiety that Marion suffers when April runs away.
Stevenson compared her own difficulties of parenting to Marion's, saying "it is easier for me than someone like Marion because I have had 14 years experience".
Richards spoke of the character of April, saying that "the residential schools and children's homes were completely different from my life. [
April] doesn't feel connected to anybody and she struggles to know who she is".
Blakeman said that she read the book in a single sitting, before "crying her eyes out". The film includes the themes of bullying, youth crime, domestic violence, unwanted pregnancy, and teenage angst. For Blakeman, April's "heartbreaking journey in searching for her real mum is also about being brave enough to let love in." Tom Sutcliffe, writing for The Independent, spoke of the limits of taboo themes in family dramas, and said the film's "account of a life lived in care couldn't have had swearing, or casual drug use, and when a shadow fell over a child's bed at night, it wasn't the care-home manager coming to exercise some horrible droit de seigneur [sic], as it might have been in an adult drama". The film also addressed the theme of Asperger syndrome through the character of Poppy. The BBC claimed that Clark, who has the condition herself, was able to offer "a unique take" on the role. Steveson summarised the themes of the film, saying that "At the centre of the story, Marion finds out that she loves this girl. And that is an amazing liberation when you discover someone more important to you than you are. That is what is incredible about becoming a parent – you care about your child more than you care about yourself."
On Behind the Bin, a making-of documentary about Dustbin Baby, Wilson said that "lots and lots of people will identify with" the central theme of adoption, as at fourteen "you start to look at your mum and dad and think 'I'm nothing like them', and everyone seems to have fantasies about that they were adopted or something, and so I think that it's a typical teenage thing that you question who you are". Richards says that she likes the idea that April "went on a journey to try and find herself" as "a lot of people [her age] try and do that because a lot of people get to the point where they're not really sure who they are any more". Richards also discusses the motif of April's paper dolls, saying that April can relate to them as in different places, she is "still the same person", but that she is "coloured in differently by different people and different surroundings". Alexandra Hewett, who played the Young April, described the dolls as April's "only real friends".
Stevenson described the character of Marion as "cranky, stubborn and lonely", saying that living alone has made her "become quite idiotic and eccentric". When the character of April arrives, Stevenson explains that "Marion has to go from nought to 80 in terms of parenting. There are lots of reasons she wouldn't get it right" which leads on to the guilt and anxiety that Marion suffers when April runs away. Stevenson compared her own difficulties of parenting to Marion's, saying "it is easier for me than someone like Marion because I have had 14 years experience". Richards spoke of the character of April, saying that "the residential schools and children's homes were completely different from my life. [April] doesn't feel connected to anybody and she struggles to know who she is".
Dustbin Baby (film)