Capitalize journal title for apa in Latex

Question

I am using overleaf to put together my references that follow the apa 7th edition. The journal titles however are not capitalized. How do I correct that? Note that I tried the method suggested in this post Capitalize journal name in latex but it didn't work for me.

Here is a minimal reproducible example:

\documentclass[man]{apa7}

\usepackage[american]{babel}

\usepackage{csquotes}

\usepackage[style=apa,uniquename=false,sortcites=true,sorting=nyt,backend=biber]{biblatex}
\DeclareLanguageMapping{american}{american-apa}
\addbibresource{refs.bib}

\begin{document}
\parencite{golinkoff1979comparison} said this 
\printbibliography

\end{document}

My refs.bib here

@article{golinkoff1979comparison,
  title={A comparison of fathers' and mothers' speech with their young children},
  author={Golinkoff, Roberta Michnick and Ames, Gail Johnson},
  journal={Child development},
  pages={28--32},
  year={1979},
  publisher={JSTOR}
}

The reference prints this:

This is a cross post: https://tex.stackexchange.com/questions/670231/capitalize-journal-title-for-apa-in-latex

Answer 1

Same method as in the post you linked to:

\documentclass[man]{apa7}

\usepackage[american]{babel}

\title{text}
\shorttitle{short title}

\usepackage{csquotes}

\usepackage[style=apa,uniquename=false,sortcites=true,sorting=nyt,backend=biber]{biblatex}
\DeclareLanguageMapping{american}{american-apa}

\begin{filecontents*}[overwrite]{\jobname.bib}
@article{golinkoff1979comparison,
  title={A comparison of fathers' and mothers' speech with their young children},
  author={Golinkoff, Roberta Michnick and Ames, Gail Johnson},
  journal={Child development},
  pages={28--32},
  year={1979},
  publisher={JSTOR}
}
\end{filecontents*}

\usepackage{mfirstuc}
\DeclareFieldFormat{journaltitle}{\capitalisewords{#1}}

\addbibresource{\jobname.bib}

\begin{document}
\parencite{golinkoff1979comparison} said this 
\printbibliography

\end{document}