begin{figure}[htbp!]
  centering
  begin{subfigure}[b]{1linewidth}
    includegraphics[width=linewidth]{files/Feb1.pdf}
     caption{No. 1 }
  end{subfigure}
  begin{subfigure}[b]{0.4linewidth}
    includegraphics[width=linewidth]{files/Feb2.pdf}
    caption{No. 2 }
  end{subfigure}
    begin{subfigure}[b]{0.4linewidth}
    includegraphics[width=linewidth]{files/Feb3.pdf}
    caption{No. 3 }
  end{subfigure}
  caption{textit{My dull caption}. Another dull caption}
  label{fig:thesefiguresdonotmatter}
end{figure}