# spacing after \paragraph in a document [duplicate]

I want to put a space between the paragraph header and the paragraph itself. But all I have tried so far, didn't work. Using \paragraph the header and the body are in the same line, whereas I want to skip at least a line between the header and the body of paragraph.

\documentclass[oneside,12pt]{book}
\usepackage[french]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\begin{document}

\section{section}
\subsection{subsection}
\subsubsection{subsubsection}
\vspace{1cm} % I want to skip a line or add space between header and the body of paragraph
body of the paragraph

\end{document}


I am using a book document, for all the answers I have seen so far are for article document or for scrbook document.

## marked as duplicate by TeXnician, Stefan Pinnow, Schweinebacke, CarLaTeX, Maarten DhondtAug 8 '17 at 8:46

In general, \paragraph style was fixed in book.cls as no below space with text runon with the heads, if you need below space then follow the below tag:

\documentclass[oneside,12pt]{book}
\usepackage[french]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\begin{document}
\makeatletter
\renewcommand\paragraph{\@startsection{paragraph}{4}{\z@}%
{-3.25ex \@plus1ex \@minus.2ex}%
{10pt}%
{\normalfont\normalsize\bfseries}}
\makeatother

\section{section}
Test
\subsection{subsection}
Test
\subsubsection{subsubsection}
Test